![]() In specific function I never use more then 5 relays Majenko, thank you, I'll give it a try in Tuesday! Relays are isolated from Arduino with opto-isolators (signal HIGH from Arduino = relay is off). Here - (power consumption per relay - 0,36W 5VDC) - you can see relay datasheet. It flows through relays: 24VDC <30W or 230VAC CrossRoads, no I use A0-A4 and Q3-Q12 (for relay module: Q3-Q7, Q9-Q11, Duncan C: Currently, I use only 9 relays, other control pins are disconnected and off. My wires: external power supply - Arduino: 0,5 mm2 Arduino - relay module control pins: 23 AWG (~0,25 mm2) external power supply - relay module +5V and GND: 1,5 mm2. If i dosconnect both +5V pin and relay module control pin, my application works fine. Jot, after disconnecting +5V Arduino pin, but with connected relay module, I get serial error immediately with first relay switch. I think the problem is because my external power supply +5V drops for a while when switching and then Arduino switches to +5V from USB (which doesn't drop), which has not enough power and then error occurs.Īm I right? Any suggestions to fix the problem? Probably error appears only when I'm switching outputs. error "device not found" (after some switches: sometimes it works for about 20 output switches, sometimes for 1 output switch) and I have to open serial communication again. But when it is connected, I get serial com. When I disconnect relay module control pins from Arduino outputs everything works fine. 1 1 1 1 1 1, then 6 outputs goes to HIGH). I control Arduino from PC using serial communication over USB (I send a command eg. Relay module is supplied with the same power supply. Link to relay module (lang: polish): (SRD-05VDC-SL-C relays).Īrduino is supplied by +5V pin and GND pins with external power supply MDR-5-10. Relay module has 16 relays (5VDC) which are controlled by transoptors pins (HIGH from Arduino = specific relay is off). I have connected to my Arduino Uno outputs relay module.
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