#esp32

Posts tagged #esp32

1. Article

   Monitor de temperatura para la heladera del kiosco: ESP32 + DS18B20 + Telegram, por menos de 15 dólares

   Che, les cuento algo que armé la semana pasada porque me salvó de otra macana. Tengo el taller de reparaciones en Rosario y al lado mi señora tiene un kiosco con una heladera exhibidora de bebidas y lácteos. Hace un mes, un sábado a la noche, se quemó el capacitor de arranque del compresor. Sí, ya sé: el técnico electrónico con la heladera rota. En casa de herrero, cuchillo de palo. El lunes a la mañana estaba todo…

   Nicolás BenítezOct 11, 202610likes10comments

2. Link

   Hamish got me onto this. Two cheap LoRa boards running Meshtastic, one in the shed, one in the ute: 6.8 km before it dropped out, with a hill in the way. No SIM, no internet, no subscription. Putting one on the roof next weekend, will report back 🔧

   Matt O'BrienSep 25, 202614likes7comments

3. Image

   spring on the farm

   Hamish TurnerSep 14, 202610likes7comments

4. Poll

   Settle it: which board should a total beginner buy in 2026?

   Matt O'BrienSep 12, 20269likes8comments

5. Article

   ESP32 module placement: why your WiFi range is 3 meter

   Every week customers send me ESP32 board for review before production. 7 of 10 have the same problem. They say "WiFi range very bad, maybe ESP32 is bad". ESP32 is fine. Layout is bad. 1. Antenna at board edge, nothing under it The PCB antenna on the module (the zigzag part) must be at the edge of your board, or better, hanging out past the edge. Under the antenna: no copper on any layer . No ground pour, no traces,…

   Leo Chen 陈立Aug 22, 202612likes10comments

6. Experience

   2 years of LoRa trough sensors on a dairy farm: what I stuffed up so you don't have to

   Kia ora. Not a programmer, just a dairy farmer in the Waikato who got sick of driving round on the quad every morning checking troughs. 400 cows, 28 troughs, 3 tanks. That run took me about an hour and a half before milking, every day, rain or shine. Two years ago I started teaching myself Arduino off YouTube. Now every trough and tank reports in over LoRaWAN and I get a ping on my phone if one is low. I've stuffed…

   Hamish TurnerJul 27, 202642likes11comments

7. Experience

   Stopped driving round checking troughs. LoRa, an ultrasonic sensor and far too much silicone

   Kia ora. Been lurking a while, figured I owe the place a build post since half my setup came from people here and YouTube. Background: 400 cows on about 160 ha just out of Matamata. Water is everything. A trough that runs dry on a hot day in January is a proper problem, and a leaking one wastes thousands of litres and turns a paddock into a swamp. For years the job was: ute, every morning, every trough. About 45…

   Hamish TurnerJul 16, 202617likes10comments

8. Experience

   The Pi Zero that cooked itself in my letterbox (and what lives in there now)

   G'day legends. This one's a confession. Last January I built a "you've got mail" notifier. Pi Zero 2 W, a reed switch on the letterbox flap, a magnet, a little Python script that pinged Home Assistant over MQTT. Took an arvo. Worked first go. Felt very clever. Then Brisbane did Brisbane. The letterbox is black powder-coated steel, faces west, and sits in full sun from about 1pm. I had the Pi logging vcgencmd…

   Matt O'BrienJun 26, 202616likes7comments

9. Article

   ESP32 battery sensor: from 4 days to about a year on one 18650. Real numbers, real mistakes

   My uncle has a coconut farm near Pollachi. He wanted soil moisture and temperature from 6 spots, every 10 minutes, on his phone. Easy, I said. ESP32, WiFi to the pump shed, MQTT, done. First version battery died in 4 days . This post is how it became about a year, with numbers, because "use deep sleep" is not an answer. Step 0: measure, don't guess You need two tools: A multimeter in series for the sleep current (µA…

   Karthikeyan SJun 16, 202637likes12comments