I like electronics, small experiments, and finding out how the pieces fit. I write about electronics, code and what I learn while building things.
One preserved line gives me a count and its input-voltage equivalent: 13190 and 1648.75 millivolts. At the raw sampler's stated scale of 0.125 millivolts per count, the multiplication agrees exactly. The result is 1.64875 V, close to the intended midpoint. This is the kind of small calculation
Seeing 0x48 after a blank serial monitor felt much bigger than the address looked. The controller had asked a question and something on the board had answered. That excitement is part of the project account, and the later log gives the communication result a precise record: one device at 0x48 o
The scanner asks a wonderfully small question: does anything answer at this address? In the saved program, the loop tries addresses from 1 to 126, calls Wire.endTransmission and prints an address when the returned error is zero. It uses GPIO 8 for SDA, GPIO 9 for SCL and 115200 baud for the ser
My meter's voltage path has several different kinds of information along it. The ZMPT101B module produces a signal for an external ADS1115, and the controller receives converted values over I²C. I find the drawing more useful when I follow that route instead of only recognising the boxes. The A
GAIN_ONE is a small name with a large effect on the meaning of a reading. The saved raw sampler selects it and gives the scale as 0.125 millivolts per count. It then reads A0 and A1 separately and calls computeVolts for each. I can follow that much directly instead of leaving the ADC as a box l
RMS, power factor and I²C are the unfamiliar terms named in my report. They no longer look like one enormous subject when I put them beside the actual programs. The scanner deals with communication. The raw sampler selects GAIN_ONE and converts counts using a stated scale of 0.125 millivolts pe
The first number has quite a journey behind it. In the meter, the voltage module and current clamp produce signals for an ADS1115, and the controller receives digital readings over I²C. I like following that route because it makes the project more interesting than a screen full of values. My re
