About 12v solar panel monitoring
The Solar panel voltage and current are sensed by voltage and current sensor respectively. Here, a voltage divider network is used to measure the solar panel voltage, and the AC723 hall effect current sensor is us.
The solar panel voltage is sensed by a voltage divider network consists of two resistors R1=47k and R2=6.8k. The output from the R1and R2 is connected to ESP32 analog pin GPIO pin 34. The output from the voltage divid.
For current measurement, I used a Hall Effect current sensor ACS 723 -20AUvariant. There are other variants of ACS723 Sensor based on the range of its current sensing. The ACS712 sensor reads the current value.
I have used an external DS18B20 probe for measuring the ambient temperature. It uses a one-wire protocol to communicate with the microcontroller. One-wire devices need a pull-up resistor connected to their signal line to be properl.
To display the solar panel parameters locally, I have used a 0.96″ OLED display. It has a 128 x 64 resolution and uses an I2C bus to communicate with the ESP32. Two pins SCL (GPIO22), SDA (GPIO21) in ESP32 are used.
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About 12v solar panel monitoring video introduction
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