Thomas Krebs - Design build details
Physical installation Details
For a transition and an extension to the supplied 20mm pipe, materials from heating and sanitary engineering were used.
The following materials were used
1x 5cm copper pipe 22x1.0mm
1x stainless steel reducer 22x28mm
1x stainless steel sleeve 28mm
1m stainless steel pipe 28x1.2mm
Design differences from v3 article
I realize the brightness detection with a simple photo resistor and have banned the BH1750 from the code and the hardware. Photoresistor and BME280 are integrated in a finished protective housing. A test tube with a rubber stopper seals the photoresistor perfectly against moisture.
The larger solar panel supplies a maximum voltage of 12 volts, the converter reduces the voltage to a maximum of 5 volts. In heavy clouds, I still get a charging current of 4.3 volts. In Germany, the days in winter are short and the sun is low, so the panel had to be replaced.
An IP65 case with a new PCB (our version3) was used as the control housing. The PCB has been in the test phase for 2 days and is not yet available as a file.
With the new test PCB I measured a power consumption of ~ 1.6mA with all connected sensors in deep sleep.
The first measurements of the power consumption were significantly higher, after a few searches I found that there are big differences in power consumption with the TP4056 charge controllers. There can be up to 4mA difference in power consumption.
Version 3.2 is ready as a layout and has been ordered from the producer for testing.