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Actually, some hard disk platters are made of glass. https://en.wikipedia.org/wiki/Hard_disk_drive_platter
How to Make GRBL + CNC V3 Shield Based Mini CNC Machine From Scrap DVD Drive
How to Calculate the Capacity of Batteries
Did you ever work this out? I'm trying to do the same thing.thanks
Continuing from my last comment, once I had everything working, I went looking for a nice presentation. I used an old Raspberry Pi box because it was just the right size for the electronics and the 16850 battery that I'm using to power it. Looks really good. Thanks once again to deba168!
Continuing from my last comment, I once I had everything working, I went looking for a nice presentation. I used an old Raspberry Pi box because it was just the right size for the electronics and the 16850 battery that I'm using to power it. Looks really good. Thanks once again to deba168!
I spent some time trying to get this working. Two issues that might help people in the future:1. Indeed, the SDA and SCL pin numbers seem to be reversed.2. When I installed the libraries, my Arduino IDE kept telling me there were new versions available. It turns out that the new libraries are slightly incompatible with the current code (particularly the OLED). So, if you're not comfortable with changing code, don't install the new libraries and rely instead on the libraries supplied.Other than that, this is a great little project requiring very little hardware. Well done!
DIY Arduino Battery Capacity Tester - V1.0
Excellent Instructable. Thank you very much. I constructed mine and it's working perfectly. Just a word to those who may be following the pictorial diagram of the circuit - there seems to be a connection missing between the 10k resistors and ground.As you'll see from the photo below, I attached a TP4056 Lithium Cell Charger Module to the 18650. This prevents the battery from discharging beyond its recommended voltage.
If you followed the pictorial diagram of the circuit, you might need to add a connection between the 10k resistors and ground. (The green wire that connects the end of the resistors - this should connect to ground.)
Programming ESP8266- ESP-201 stand alone with Arduino IDE
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