![]() I used an LCD screen that's widely available for the very popular nokia low-end phones like Nokia 101, Nokia C1-00, X1-00 and similar because it's very cheap ( about $1.5 in the phones repair shops in my country, Iraq) and it needs only 4 GPIO's to drive and the most important thing is that it doesn't need any connector and can be soldered directly to the pcb. ![]() the same principle applied to the current measurement except that I use a current transformer here (75/0.1 A) and a shunt resistor (100 ohm) across the CT terminals to convert the current into AC voltage then measure it using the same way described in voltage. ![]() the basic idea of measuring AC voltage is to downsize the AC waveform using a resistor ladder, then DC-filtered and finally DC-biased to eliminate the negative part of the waveform by adding a dc voltage then enters to one of the ADC channels. The circuit is very simple that uses an STM32F030F4P6 Microcontroller, LCD, ESP8266 and a few SMD resistors and capacitors. ![]() And this is one of my humble projects that i would like to share. As an electrical engineer, I enjoy monitoring all electricity variables, locally and remotely. ![]()
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