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pflamiku 3

is a automatic watering system for indoor plants. The hardware is build around an STM32L031 microcontroller.

For programming and debugging

you could use the free SW4STM32 software and toolchain from ST microelectronics. It is also possible to import this in Atollic trueStudio.

This software is for measure 3 or 4 weight scales.

Depended on the min and max programmed weight of the plants it starts a pump which is pumping water to the plant until it's max weight value is reached. The min and max values can be programmed very easy by one switch. Put a plant with dry plant soil on the device. Put the switch in prog position. The pump automatically begins to pump water to your plant. If the potting soil is wet enough put the switch in position run. From now on the device waters your plant automatically between these two programmed min and max values. Each time the weight goes under the minimum the pump runs until the maximum or a timeout is reached. The timeout value is that time doubled, that the device needed while you programmed it. This is thought as a security feature. In example if the water storage tank is empty Another feature is that the device is going in deep sleep mode if there is not enough ambient light. Normally in the night. That switch value can be programmed as well. Therefore you've to wait for the according twilight condition. Disconnect the power plug, put the switch in PROG mode, connect the power plug again. Wait until the red LED blinks. Then put the switch in normal run mode. That's it. Now the device doesn't start until it is brighter then the twilight value. Another automatic feature is the brightness of the lED. It is adjusted automatically in respect to the ambient light.

#The Hardware is also available under the terms of CC BY SA NC 4.0 PCB and Schematic on EasyEDA