Buying Guides

Guides built from data/guides.json and data/parts.json. Each comparison pulls only parts I have in a running build, with the real verdict and the affiliate link (where I have one).

• Temperature Sensors for Raspberry Pi: 2026 Buying Guide
• Radio Links for Raspberry Pi Sensors: HC-12 vs WiFi with ESP32-C3
• Energy Monitoring on Raspberry Pi: CT Clamps and ADS1115
• DS18B20 Troubleshooting Guide: CRC Errors and Long Runs
• CT Clamp Burden Resistor Selection and ADS1115 Calibration

Related reading

• How to Spot a Fake DS18B20 Temperature Sensor on a Raspberry Pi

  Spot a fake DS18B20 on a Raspberry Pi: family-code check, sysfs CRC test, and ice/boil calibration against the datasheet. 3 of 7 probes in one batch were counterfeits, drifting 1.5–3.5 °C.

• SQLite Rollups and Retention: Stop Your Sensor DB From Eating the SD Card

  How rollup tables and a retention policy keep a Raspberry Pi sensor SQLite database from growing unbounded — and why SD-card wear is rarely the real problem.

• CT Clamp Burden Resistor Calibration for ADS1115 on Raspberry Pi

  CT clamp burden resistor calibration for ADS1115 on Raspberry Pi: pick the external burden, stabilise with a decoupling cap, and apply the DC-bias correction that separates a stable watt reading from drift — with the 51 Ω + 10 µF combination I actually measured.