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PIC Training Course Grow Light Controller building a grow light and creating software for controller Second Edition December 2025 |
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This short course is for hobbyists who have an interest in experimenting with new ideas. As you work through the training manual you will build a grow light which runs with 80% efficiency with any input voltage between 10v and 24v. We start by using the controller as a simple time switch, then add the circuits and update the software to run the grow light from a solar panel and a 12v battery. |
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This shows the GROWCON31 grow light controller. This second edition of our grow light controller has all the features of the original version but has been fitted with a larger regulator. The regulator is important if your system includes a solar panel and a 12 volt battery. The regulator for the first edition is limited to a maximum charging current of 2 amps. The regulator for this second edition is able to run continuously at 5 amps. This can be very important on a bright sunny day in the middle of sommer when a 100 watt solar panel will provide more than enough power for the grow light. |
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We start by programming the circuit as a simple timer and power switch to turn the grow light on each day between 6am and 8pm. To do this we load the real time clock software from the Brunning Software library then add the simple test instructions to monitor the hours counter. It is good to know the power that goes to the grow light so we load the analogue to digital library routines and add the instructions to write the voltage, current and power to the LCD. In this way we gradually work through the task of designing the PIC circuit and creating the complex software needed for using any of the three power sources efficiently. |
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In chapter 2 we learn about grow lights and the theory of which colour LEDs are required. Then I give details of how my grow light is put together using araldite, two strips of ply wood and six lengths of heatsink. |
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The LEDs are glued to the heatsinks using a very thin coat of alraldite and wired in six groups of three LEDs. Two groups of three are wired in parallel to one of three constant current circuits. This system creates a grow light which runs with over 80 percent effeciency with any input voltage between 10v and 24v. This ensures that the grow light can be run from a 12v battery at its lowest voltage and from a 12v solar panel at its highest voltage. |
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The GrowCon module can be programmed using a Brunning Software programmer or PICkit3/4. The book assumes a P205, P931, P942 or P955 Brunning Software programmer is being used. The software is usually supplied on CD. If you require software on a memory stick send an email request to pic(at)brunningsoftware(dot)com Price List If you already have a Brunning Software programmer (P205, P931, P942 or P955) you need option 1. If you do not have a Brunning Software programmer you need option 1P. |
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Option 1: Grow Light Kit and Fully Populated GrowCon31..... £77.00 including delivery to UK GrowCon31 supplied built and tested.
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Option 1P: Grow Light Kit and fully populated GrowCon31..... £97.00 including P205 PIC programmer including delivery to UK GrowCon31 supplied built and tested.
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