Electronics & Gadgets
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Digital Temperature Controller Module HW-557 V9.0
$15 (rough estimate)
A digital temperature controller circuit board featuring a 3-digit 7-segment display, control buttons (SET, +, -), and connection terminals for sensors and power. Used for monitoring and regulating temperature by switching connected devices on or off based on set thresholds.
MRF905 RF Transceiver Module
$10 (rough estimate)
This is an MRF905 RF transceiver module used for wireless communication in the 900 MHz ISM band. It features a small PCB with an SAW oscillator, microchip labeled MRF905, and an SMA antenna connector. Commonly used in hobbyist and low-power RF applications such as remote controls, sensor networks, and amateur radio systems.