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Why did you put this in a shoe ? If you walk into water or if you walk on a nail, battery will explode...If the battery cover plate break, battery may get damage and again, flames and explosion.Just put this in a safe enclosure, in your bag, not in your shoe...
Hi,if you use PWM instead of MPPT, you lose lot of power.If best conditions, your solar panel give 18V/40W, but because of PWM, you force your panel to work at 12V, so you get only 26W (30% lost). MPPT will work at 18V, giving you the maximum power from panel (MPPT = Maximum Power Point Traking).(sorry if bad english, not my natural langguage)
only the LDR use analog input, so you can replace arduino+esp8266 with esp8266 only. ESP8266 has one analog input and some digital inputs. Use a Wemos D1 mini, for example. For less than 3$, you have usb power, 3.3V input/output pin, 5V input/output pin, 1 analog input, 9 digital pins
Sim card doesn't received the signal, the antenna does. Stickers booster don't work, it's always fake ! If this small metal thing increase reception, manufacturer would have use it !!!If you want to boost the signal, use a better antenna: disconnect the original and plug an extenal antenna.