Symptom: You have a relay connected to your Arduino, and after a while your Arduino stops running. That’s not supposed to happen, these things loop forever, right? It’s a common issue when running inductive loads from a Arduino controlled relay.
Recently we produced a 6 Channel IR interface for IR transceivers like the TCRT5000 pairs. Lots of Model Railroading and other object detection applications. Now we have the less expensive 2 channel version available. Same code, same components, just less
Did you know the inexpensive Pittsburgh / Chicago Tool / Harbor Freight Calipers (4 pin dataport under battery cover) have a digital interface? We can read that interface with an Arduino, just like we do with the Mitutoyo / Igaging calipers
Ever want to view / control devices at home while on the road? As part of our IoT initiative, I have set up a broker based on Mosquitto. Mosquitto uses MQTT, a publish and subscribe mechanism that avoids the necessity