Target Shooting Lights Controlling Timer

Pictured below is a timer for use in competitive target shooting. Usually we make turning target controllers which turn the target to face and away from the shooter at the required times. This controller instead is for use with a fixed target, using a red and a green light to tell the shooter when to shoot.

shooting target lighting controllerThe red light starts off on. The start/stop button is pressed and the range master gives a vocal command for shooters to load. After 30 seconds, the red light turns off and the green light turns on – shooting commences. After a user programmable timer period has elapsed, the red light turns on again, the green light turns off, and shooting stops.

With this particular controller, the available timing options are fixed as 4, 6, 8, 10, 20, or 150 seconds. The timer option button is used to cycle through those options with red indicator LEDs used to show which option is currently selected. (We also make timers like these with a physical display and the ability for the user to change the values of the timing options instead of having a fixed selection – see here for details of some of our other shooting timers.)

The type of bulb to be used with controller is pictured below: a low current 12VDC powered 22ds LED bulb from Onpow.22ds 12vdc LED bulbIf you need any type of shooting range timer, please email with details of your requirements.

Conservatory Cooling Fan Controller

We sell a wide range of types of differential temperature controllers which are primarily used in solar hot water systems. However, with slight modifications, they can also be put to good use in other scenarios.

thermostat for conservatory coolingPictured above is an Arduino Pro Mini based fan controller we made for use in conservatories and other sunny rooms to help to keep the temperature from getting too hot.

This device can be used to turn on an extractor fan when the temperature in the room gets above a user set value, and keep it on until the room temperature has fallen below a second user set value. By dumping excess hot air from the room, the room’s temperature can be kept in a comfortable range.

display for conservatory cooling fan controller

In the photograph of the device’s display above, the air temperature is showbn to be measured as 18.2C. The fan (which is currently off) will turn on when the air temperature goes over 25C, and then turn off again when the air temperature falls below 20C.

We have also previously made these types of thermostatic controllers to automatically drive hot air from a sunny conservatory into cooler regions of the house. An insulated conservatory can still get very hot even in the winter months, so sending the hot air to the cooler side of the house is an easy and cheap way to reduce heating bills.

12V Low Voltage Disconnect with Display and SD Card Datalogger

12V low voltage disconnect with display and sd card dataloggerPictured above is a low voltage disconnect device which we recently made for a client. It offers all of the battery monitoring, protecting, and datalogging functions and features of our REUK Programmable Low Voltage Disconnect with Display and Datalogger, but with the added benefit of an on board microSD card to store the measured battery voltage once per minute.

low voltage disconnect sd card datalogger

The voltage data is written to a simple text file on the SD card. When the battery is connected to the low voltage disconnect and powers it, POWER CONNECTED is written to the log file. Then each subsequent minute, the battery voltage is written to the file preceded by the number of minutes since the power was last connected. For example the line 6,13.98 indicates that 6 minutes after the power was connected, the battery voltage was measured to be 13.98V.

While the pre-existing basic datalogging of the LVD is useful for constantly displaying the minimum, maximum, and average measured voltages, every now and then it is good to have the option to copy the data from the SD card to a PC for more detailed analysis and plotting etc.

If you need any kind of datalogger, please email with details of your requirements.

Solar Water Heating Pump Controller for Distant Pool

Pictured below is our standard 2016 Solar Water Heating Pump Controller with Datalogger. We recently made a modified version of this controller for use in a particular situation where the standard unit would not be very efficient.

2016 SOLAR PUMP CONTROLLER WITH LCD DISPLAY AND DATALOGGER. Solar water heating pump controller with backlit display to show temperatures and system status information and a dataloggerIn this case, the controller was to be used to heat a swimming pool. The problem was that this pool was located 30 metres away from a garage where the controller would be fitted, with 50mm water pipes already installed running underground to and from the pool from the garage (on the roof of which were installed solar water heating panels). There was therefore no easy way to retro fit a temperature sensor at the pool – that would necessitate digging a new 30 metre long trench, fitting sensor cable into an armoured tube, and burying it.

It was however possible to fit a temperature sensor to the return water pipe where it emerged in the garage, but the contents of that pipe would cool down much faster than the large volume of water in the pool, and this would result in the pump being turned on frequently unnecessarily, often cooling the pool instead of heating it.

To get around this problem, the controller was modified to provide additional features. The key feature was that the pump would not be turned on until the temperature of the solar panel exceeded a user programmable value. When this threshold is reached, the pump is run for a user programmable number of seconds (TD) which circulates the water through the system sufficiently to get an accurate measurement of the temperature of the pool water. When TD seconds have elapsed, if the temperature differential between the solar panel and pool exceeds the user programmed differential (diffOFF), the pump will continue to run until the differential falls below diffOFF – standard operation for the 2016 controller.

If however after the test run of the pump, the differential is not high enough, the pump will be turned off, and the temperature of the pool sensor will be saved. For up to the next four hours this saved value of the pool temperature will be used rather than the sensor temperature (which will rapidly fall when the pump is turned off). The pool temperature over the course of 4 hours will not fall by more than a degree or two, so using this saved value is acceptable for efficiency. During the 4 hours, if the temperature differential exceeds the second user programmed differential (diffON), the pump will be run as per standard operation and after TD seconds the controller will start to use the current pool temperature sensor measurement instead of the previously saved value as the pipe in the garage will now be at pool temperature. The pump will continue to run until the differential falls below diffOFF.

If during the 4 hours, diffON is not achieved, the controller will wait until the solar panel temperature exceeds the user programmed temperature before running the pump for TD seconds again and repeating the above processes.

Overall these modifications (together with a few additional features not described above) will result in a far more efficient system than our standard controller would have given and less wear on the pump.

If you have any special requirements which are not met by our standard controllers, please email with details.

Replacing 30 Year Old Solar Hot Water Controller

Pictured below is the differential temperature controller fitted to a 1980’s solar hot water system. After many years of successful operation, this controller finally failed (pump stays on all the time) and needed to be replaced.

Old solar water heating pump controllerSomething functionally identical was required, at least externally for the benefit of the user, so we were tasked to build a differential controller with relay to switch a mains powered pump, and to include a power on LED indicator, a pump on LED indicator, and a physical switch to select between standard automatic operation and ‘override’ which forces the pump to run.

Circuitry found in 1980's differential temperature pump controller

The internals of the old controller are pictured above. It shows a simple system with mains power going in and coming out again on its way to the pump switched by a relay, a transformer to get low voltage DC from the incoming mains AC, a potentiometer which is probably there for the installer to set the temperature differential required between solar panel and hot water tank for the pump to be turned on or to zero the measured difference when the sensors are at the same temperature, and the connections (two core) for two temperature sensors which are almost certainly going to be thermistor type sensors. There is also an IC visible which will most likely is a microcontroller, a 555 timer, or a comparator.

The sensor leads (and all other leads) were soldered in place upon installation, and the sensor cables were run through walls and are therefore inaccessible. Since the existing cables were 2-core, we had to build the new controller using sensors with two connections – LM335 – rather than the 3 connection digital sensors we use in most of our controllers – DS18B20 temperature sensors.

Our 2013 Solar Water Heating Pump Controller is the most similar unit we sell to this existing controller, so used that as the foundation of the controller we built.

modified 2013 solar water heating pump controllerAll LEDs, buttons, and switches have to be external to the controller board, so these have extended leads which connect via screw in terminals. We supplied a plug in 12VDC power supply rather than fitting a transformer directly to the circuit board, and we added an LED which turns on when the unit is powered, and the override switch which can be used to force the pump to run. We fitted the programming button (used to set the temperature differentials at which the pump turns on and turns off) to the circuit board, but connected terminals in parallel with it so that an external button can be panel mounted now or at a later date.

If you need a modified version of one of our differential temperature controllers, please email with details of your requirements.

Animal Feeder Motor Controller with Timer

Pictured below is a motor controller we made recently for an automatic animal feeder system.

Animal feeder motor controller with timerThe feeder itself has two buckets on a belt which is connected to a 12VDC motor. When the motor is run, the buckets scoop up feed from a container and drop it into a trough for the animals. If the motor is left running, more and more feed will be scooped up and added to the trough, so a controller was required to ensure that each time the motor was run, the correct amount of feed was deposited in the trough reliably.

The motor needs to run for less than one minute each time, therefore a 12V programmable digital timer was chosen. The user can programme the timer to turn ON for one minute at the exact times of day that the animals are to be fed.
A switch was added to the mechanical setup which closes each time the buckets have completed one full revolution – i.e. picked up and deposited feed.

The central controller waits for the timer to turn ON. Then it turns on the motor, and keeps it running until it detects the mechanical switch closing indicating that the feed buckets have been through one rotation.
When the timer next turns ON, the switch status is ignored for the first couple of seconds (since it remains closed until the motor has moved the buckets around a bit), and then the controller keeps the motor running until the switch closes again…another feed complete. This automatic feeder will keep the animals fed the right amount at the right times of day for as long as there is feed left to be scooped up.

If you need any kind of timer or motor controller, email with details of your requirements.

Poultry Egg Incubator with Humidity Sensor

Pictured below is a controller we recently made for use in a poultry egg incubator, designed to keep eggs within a very narrow specific temperature and humidity range for a few weeks. This is achieved using a heater, a fan, and a humidifier.egg incubator with humidity sensor, fan, heater, and humidifierThe eggs need to be turned at least three times per day every day except for the last few days before hatching. Previously we made a Controller for Poultry Incubator which had a motor which was turned on and off at different times of the day to turn the eggs. For this new incubator, the motor used is a very slow turning 12 VAC device makes 6 full rotations every 24 hours. That motor therefore did not need to be controlled with a timer – it is just left running at all times.

egg incubator controller status summary displayThe display for this controller shows the current measured temperature from the waterproof DS18B20 digital temperature sensor (read at 12 bit resolution = 0.0625°C resolution), and the humidity from a DHT11 sensor (within 5% accuracy). The DHT11 actually has a built in thermistor, but its temperature measurements are nowhere nearly accurate enough for this type of project.

The bottom line of the display shows the three devices being controlled – heater, fan, and humidifier respectively. In the image above, the heater is marked as being on. If the humidity level gets too low, the humidifier will be switched on. If the temperature gets too hot, the fan will turn on (and of course the heater will already be turned off by then).

Setting humidity range for poultry egg incubator

The user has full control over the thresholds at which the heater, fan, and humidifier will turn on and turn off. The temperature thresholds for the heater and fan can be set in steps of 0.2°C, and the humidity thresholds in steps of 2%.

For example, the heater could be set to turn on at or below 36.4°C and off again at or above 38.4°C. Then the fan could be set to turn on at or above 38.6°C and off again at or below 37.4°C. Humidity should ideally be around 60% (raising to 65% just before hatching), so the humidifier could be set to turn on at or below 56% and off again at or above 64% relative humidity.

display for egg incubatorWith all the thresholds programmed in by the user according to the requirements of the particular type of eggs to be incubated, a button can be pressed to show in turn the values programmed in – for example, above the humidifier is shown to be set to turn on at or below 43% RH and turn off at or above 70% RH.

If you need any kind of egg incubator controller (or the electronics for a temperature and humidity controlled humidor – functionally pretty much identical to an incubator!) – please email with details of your specific requirements.

User Programmable Target Shooting Controller with Display

Pictured below is a target shooting controller which we recently made for a shooting club in Australia.

programmable shooting target controllerWe had previously made them a controller with fixed time series – for example, Standard Pistol 150s, 30s, and 10s, Centre Fire face target 3s then away for 7s repeating 5 times, and Rapid Fire 8s, 6s, and 4s. Other clubs in the area required something similar, but with flexibility in the timings.

shooting target controller display - start seriesWe therefore enhanced the software written for the original controller so that all of the different time series could be modified, reducing or increasing the time that the target faced the shooter by the operator at the range to meet specific and potentially changing needs.

shooting target controller display modify series timingWhen the start button is pressed, the target turns away from the shooter. After 7 seconds the on board buzzer sounds for half a second and the target faces the shooter. (An external 12V buzzer or siren can be connected to the terminals on the controller board if a louder sounds is required). After the user programmed time, the target turns away from the shooter (again accompanied by the sound of the buzzer), and then a further 7 seconds later, the target is turned back to face ready for the next shooter.

NEW – We now also produce a modified version of this controller which allows the operator to set the edge times of the target independently for each of the series instead of using a fixed 7 seconds for all of them.modify edge times for shooting target controller modify face and edge time for shooting timer controller

Order a Controller

If you need any kind of shooting target timer controller, please email with your specific requirements. (Click here to view some of the turning target and other shooting timers we have supplied in the past.)


Target Shooting Timer Example Instructions

programmable target shooting controller with display

Pictured above is the version of this shooting target timer controller which we currently sell. It is physically smaller, but otherwise functionally identical to the original, and the connections are the same as per the photographic diagram at the top of this post.

On the controller there are two buttons. Press button1 (Down) to run the currently displayed series. Press and hold button2 (Up) for more than half a second to be able to select from the seven saved series (using button1 to go down and button2 to go up through the list).

The device is fitted with a 10A rated SPDT relay with NO, COM, and NC connections. It has the relay energised when the target is to be faced, and de-energised when the target is to be edged. You can therefore wire things up whether your solenoids need to be powered to face the target, or need to be powered to edge the target using the NO-COM or NC-COM connections respectively.

When a series has run to completion, the target will edge, the screen will go blank for 7 seconds and then the target will face with the controller reset and ready to be run again.

In order to modify any of the timings of the seven pre-programmed series, press and hold button1 for 5 seconds or longer. Then, use button1 to decrease the number of seconds for the selected series, or button2 to increase the number of seconds. The value will be shown on the screen as you increase or decrease it. After five seconds of inactivity (no button presses), the new displayed value will be saved under the name of the selected series – e.g. Standard Pistol 150s could become Standard Pistol 125s or whatever you have set it as.

The maximum time limit is 254 seconds for any series – e.g. you could set Standard Pistol 254s, but you could not set Standard Pistol 255s or higher.

Hen House Door Controller for Dawn/Dusk or Timer Operation

Pictured below is a controller we recently made to open and close the door of a hen house automatically.

hen house door controller with light detector for dawn/dusk operation and a programmable digital timerWe make a lot of door controllers for a range of different needs, and in general they either open and close the door depending on times programmed into a timer, or automatically detect dawn and dusk with a light detector and open or close the door accordingly.

With this particular controller, the user can select between two modes – dawn/dusk mode or timer mode. If timer mode is selected, the door will open when the timer turns ON and close when the timer turns OFF. In this way the door can be made to open and close at times convenient to the owner – for example opening the door later on weekend mornings so that the poultry do not disturb neighbours.

If instead the dawn/dusk mode is selected, the door will open at dawn and close at dusk, with the ambient light level for the day-dusk and night-dawn thresholds calibrated by the user when setting up the controller and light detector in its location.

If you need any kind of automatic door controller, email with details of your specific requirements.

Turning Shooting Target Controller

Pictured below is a controller we recently made to control a shooting target for competitive around an Arduino Pro Mini, this device is used to edge or face a shooting target according to preset and user-set timings.

Display for a shooting target controller

By default, the target is edge on to the shooter. When the start button is pressed, a relay closes which turns the target face on to the shooter. An accurate timer then starts and counts down the number of seconds the shooter has until the target is turned edge on again.

There are five preset modes – 165 seconds, 35s, 8s, 4s, and 2s. There is also a sixth mode which the user can programme to be any duration from 1 to 999 seconds.

Buttons are fitted to the circuit board, but there are also connectors to which external buttons can be connected so that the device can be fitted in a box with just the two external buttons and display visible.

If you need any kind of shooting target controller, please email with details of your requirements.