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The projects people are opening, remixing and finding useful in the last three weeks.

ESP32 temperature-controlled fan: DS18B20 and a MOSFETZen Circuit Lab11 openedSolar floodlight: 24 SMD LEDs on three 3.2 V LiFePO4 cellsZen Circuit Lab16 openedHybrid solar system: 2700 W of panels, 48 V battery, grid backupEdison Nunez0 openedBrownout-proof Wi-Fi: a LiFePO4 DC UPS for your router, under ₱5,000Zen Circuit Lab4 openedArduino keypad door lock: 4×4 keypad, servo bolt and LCDZen Circuit Lab4 openedSolar TV and fan with a 300 W inverter, under ₱30,000Zen Circuit Lab3 openedDC Fan with ChargingZen7 openedSolar power for a Starlink Mini on 12 V, under ₱20,000 (dish not included)Zen Circuit Lab2 openedESP32 parking sensor: HC-SR04, three LEDs and a beeperZen Circuit Lab4 openedAutomatic cooling fan: LM35 + LM358 + MOSFETZen Circuit Lab4 openedSolar fan, lights and phone charging on 12 V, under ₱15,000Zen Circuit Lab1 openedSolar lights and phone charging for one room, under ₱10,000Zen Circuit Lab1 openedESP32 weather station with a comfort word: BME280 and OLEDZen Circuit Lab1 openedArduino parking sensor: HC-SR04, three LEDs and a beeperZen Circuit Lab1 openedESP32 rainbow lamp: 16 WS2812 LEDs, a speed knob and a mode buttonZen Circuit Lab3 openedESP32 weather station: BME280 on an OLEDZen Circuit Lab3 opened0–9 counter on a 7-segment display: 555 → 74HCT393 → 4511Zen Circuit Lab3 openedTraffic light from a 555, a CD4017 and ten diodesZen Circuit Lab3 openedElectronic dice with real pips: 555 + CD4017 + diode logicZen Circuit Lab2 openedBuild your own 12.8 V 12 Ah LiFePO4 pack: 4S2P 32700 cells and a BMSZen Circuit Lab0 openedESP32 water tank level meter: HC-SR04 and OLEDZen Circuit Lab0 openedESP32 thermocouple thermometer with an alarm: MAX6675 and OLEDZen Circuit Lab0 openedESP32 DC power meter: INA219 and OLEDZen Circuit Lab0 openedESP32 kitchen scale: HX711, load cell and OLEDZen Circuit Lab0 opened