AMS1117-3.3 pinout (pin 1 GND, pin 2 VOUT, pin 3 VIN), datasheet specs, minimum and maximum input voltage, 5 V to 3.3 V wiring and capacitors, why it gets hot or resets your board, a calculator, and when a TLV740P is the better choice.
TMP235 datasheet explained in one page: 10 mV/°C analog output with a 500 mV offset, ±0.5 °C typical accuracy, 9 µA, 2.3 to 5.5 V, the SOT-23-3 and SC70-5 pinouts, the temperature formula with Arduino and ESP32 code, ADC filtering rules and how it compares with the LM35.
TPS22919 datasheet explained in one page: 1.5 A, 89 mΩ, fixed soft-start slew rate, the SC-70-6 pinout, what the QOD pin does, how to calculate inrush and fall time, and when a load switch beats a bare MOSFET.
TMP6331 datasheet explained in one page: TI’s 100 kΩ linear silicon PTC thermistor (TMP63 family), ±1% tolerance, 6400 ppm/°C, polarity, the 100 kΩ ratiometric divider circuit, self-heating limits, Arduino code and how it compares with an NTC thermistor.
TPS7A03 datasheet explained in one page: 200 nA quiescent current, 200 mA, 270 mV dropout, the SOT-23-5, X2SON and DSBGA pinouts, output capacitor limits, battery-life math on a coin cell, and the noise and transient trade-offs that come with nano-amp idle current.
TLV740P datasheet explained in one page: 300 mA, 460 mV dropout, 50 µA quiescent current, the SOT-23-5 and X2SON pinouts, why EN must never float, the 85 °C junction limit and what it means for current from 5 V, and how it compares with the AMS1117.
TPS7A20 datasheet explained in one page: 7 µVrms noise, 95 dB PSRR, 300 mA, 6.5 µA quiescent current, the SOT-23-5 and X2SON pinouts, capacitor rules, thermal math from 5 V, the typical application circuit, and a ready-made TPS7A2033 module if you’d rather not solder it.
ADS1115 guide for Arduino, ESP32 and Raspberry Pi: wiring and I2C addresses, choosing the gain, why inputs must stay below VDD, input impedance and noise, ADS1115 vs ADS1015, and a 2-minute test to spot fake 12-bit modules. Includes a gain calculator and a fake checker.
How to read a 4–20 mA transmitter with Arduino, ESP32, Pi Pico or ADS1115: the right burden resistor for your ADC, 2-, 3- and 4-wire wiring, the loop voltage budget, protecting the pin from a 24 V short, open-loop and fault detection (NAMUR NE43), and which 4–20 mA converter to use. Includes an interactive calculator.
Free voltage divider calculator for Arduino, ESP32, ESP32-S3/C3, Pi Pico and ADS1115. It picks real E24/E96 resistors, shows the ADC reading, source impedance, tolerance error, resistor power and battery drain, warns before you exceed a pin’s limit, and gives you ready-to-paste code.