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Learn how to use the TP4056 properly. There's a right way, and a wrong way, to use it to safely charge Lithium Ion batteries.
The MCP4728 chip is a four channel 12 bit DAC, with memory that outputs voltage that you can use for calibration, anywhere you want a fixed voltage.
Find out how to connect the Hitachi HD44780 and use it to display text and graphics in any of your projects.
INA219: How to use the INA210 for maximum accuracy in current and power measurements
Arduino oversampling is a technique to increase ADC resolution by reading more samples then decimating. It really does work!
A tutorial on using the ADS1115 precision 16 bit ADC for low power use.