Timeline for Reading multiple bytes from *software* serial
Current License: CC BY-SA 3.0
11 events
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| Mar 16, 2014 at 19:36 | comment | added | Alexander | I have dedicated relay board - dx.com/p/202361 - it has flyback diodes. By mistake I've ordered 12V board, not 5V - so I am powering it from Vin pin of my Arduino - so it gets unregulated power supply. Relay board is not a problem - it is probably the 220VAC power lines being close to Arduino's 5VDC lines. Will need to spread them farther, as I wrote above. I'll need to figure out how to insulate 5V lines though - I believed using wires in twisted Ethernet cable would be fine, but it looks like I need to switch to some shielded cable. | |
| Mar 16, 2014 at 13:05 | comment | added | jfpoilpret | Just to be sure, you also used flyback diodes on relays right? How do you command your relays: directly from Arduino pins, through a transistor, a Darlington, a MOSFET? | |
| Mar 16, 2014 at 12:28 | comment | added | Alexander | I've added decoupling caps everywhere I could, it reduced the problems but didn't fix them entirely. Probably I will have to physically separate relays and Arduino to two different boxes, and will add separate AC-DC power supply unit for relays. I'll also order relays with optocoupling instead of existing relay board. | |
| Mar 16, 2014 at 11:45 | answer | added | Cybergibbons | timeline score: 3 | |
| Mar 16, 2014 at 11:38 | comment | added | Cybergibbons | Noise bad enough to cause Serial to corrupt is likely to cause other problems on I/O. Fixing the commands won't fix other issues, and it's likely you system would fail in another way. | |
| Mar 16, 2014 at 9:09 | comment | added | jippie | As @jfpoilpret mentions, investigate the cause of the noise. It is usually easier to fix the cause than to remedy the data corruption. | |
| Mar 16, 2014 at 8:19 | comment | added | jfpoilpret | Providing a schematic of your circuit would help. The best way to solve your problem is to first try to reduce the noise, this has to be done electronically. | |
| Mar 16, 2014 at 7:39 | comment | added | Alexander | I've replaced today the wire connected to Serial1 (I've used piece of Ethernet Cat5 twisted pair patch cord) with Bluetooth dongle - it didn't help, I still see garbage in log and Arduino still acts weird - it receives "phantom" keypresses from "debug" console. | |
| Mar 16, 2014 at 7:33 | comment | added | Alexander |
Yes, they are totally random: here is tiny example from my debug log (notice the garbage as the 'Inlet' valve turns off and the current inducted by AC coil messes with power supply): [3819448 void turnOff_pin_Inlet()] WкК•╧╠•я² [3819570 void checkTempSensors()] DS18B20 on Door failed!
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| Mar 15, 2014 at 23:52 | comment | added | microtherion |
Serial1 on a Leonardo is not "Software Serial", it’s arguably more "hardware" than Serial. How does the noise on your serial port manifest? Are the characters injected truly random?
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| Mar 15, 2014 at 22:38 | history | asked | Alexander | CC BY-SA 3.0 |