Leaderboard

This is a simple voltage and current meter that uses the TI INA219 chip. Voltage measurement range is 0 to 26 volts with 4 mV resolution and current measurement range is -4 to +4 amps with 1 mV resolution (when using a 0.01 ohm shunt). The specs are inferior to a pair of quality multimeters, but it is a fraction of the price and shows wattage in addition to voltage and current. The Nokia 5110 display is used so the firmware could be enhanced to do simple graphing. Sending the measurements to a computer could also be done. Using the INA219 makes for a very simple circuit. The normal d

I posted this over at fatwallet. Link Depending on if you use fatwallet or not the price is either $51.29 or $48.73 (after Fatwallet CashBack). As for the devices capabilities: [*:3uwr7ymh]Auto-Ranging! (No more setting the range) [*:3uwr7ymh]TrueRMS! (I think this is one of the better prices I have seen for a TrueRMS meter, let alone with auto-ranging) [*:3uwr7ymh]Voltage: The lowest range is 220mV highest is 750V [*:3uwr7ymh]DC Voltage: The lowest range is 220mV highest is 1000V [*:3uwr7ymh] AC Current: The lowest range is 220uA (thats micro amp I am suspicious

The accuracy is +/- 0.2% typical. That is similar to a low cost 3 1/2 digit DMM. It alternates between current and voltage samples. It only has one ADC. For 12 bit resolution it takes about 1 millisecond to sample both current and voltage, so about 1000 samples per second. The resolution can be adjusted down to 9 bits for an almost 10x increase in speed. It is also possible to average up to 128 samples. Full details are in the spec sheet linked in the first post.