 Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me. |
Forum Index : Microcontroller and PC projects : IR Receive ... odd phenomenon
| Author | Message | ||||
| LouisG Senior Member  Joined: 19/03/2016 Location: AustraliaPosts: 129 |
Hi guys, I'm a MicroMite veteran who is having his first crack at a PicoMite. My project is to operate 24 relays from a PicoMite, singly or in combination, using an IR remote signal. Pins used will be GP0 to GP23 for the relays, GP24 for the IR receiver. Outputs will be into optocouplers with 1K series resistors. I built breadboard versions of the IR Tx and Rx. The trial IR Tx works, successfully sending Device code = 1 and Key code = 2 on powerup. The IR Receive breadboard follows the example in the PicoMite manual 5.07.05, page 30, and with the 9 lines of example code loaded it displayed the above two codes on the console accurately. However, when I added SETPIN code for setting up the 24 digital output pins the receiver stopped receiving the IR codes. See code below. DIM INTEGER Relay(24)=(-1,1,2,4,5,6,7,9,10,11,12,14,15,16,17,19,20,21,22,24,25,26,27,29,31) FOR i = 1 to 24 : SETPIN (Relay(i)),DOUT : NEXT DIM INTEGER DevCode, KeyCode SETPIN 32, IR IR DevCode, KeyCode, IRInt DO PAUSE 1000 LOOP SUB IRInt PRINT "Received device = " DevCode " Key = " KeyCode END SUB If I delete or comment out the FOR...NEXT statement in Line 2, the IR code is accurately received, as displayed on the console. If I leave the FOR...NEXT in, the IR code is not received (although the 24 outputs are properly set to DOUT). I need both! What am I doing wrong? Any help would be appreciated. Louis |
||||
palcal Guru  Joined: 12/10/2011 Location: AustraliaPosts: 1993 |
Should it be SETPIN Relay(i),DOUT "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
||||
| LouisG Senior Member Joined: 19/03/2016 Location: AustraliaPosts: 129 |
Thanks Palcal. I think Setpin is working OK. Not getting any error messages, The Outputs are correctly set as DOUT. I checked them from the command line. - |
||||
TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6283 |
As a test, don't set PIN 31 as an output. There might be some interaction between 31 and 32 as both are analog pins. You could take it further with all the pins and see if it is only one or a few pins that causes the problem. I assume you have tested your wiring to make sure there isn't a bridge between 31 and 32? Jim VK7JH MMedit |
||||
| LouisG Senior Member Joined: 19/03/2016 Location: AustraliaPosts: 129 |
I checked, Jim. No bridge between 31 and 32. I removed pin 31 from Setpin array. Still the same phenomenon. - |
||||
phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2642 |
An experiment. What happens if you setup the IR & PAUSE 100 before the DOUTs? Does it stop working? Does a PAUSE 1 in the For / Next loop help? |
||||
| LouisG Senior Member Joined: 19/03/2016 Location: AustraliaPosts: 129 |
Will try, Phil99 However, Jim's suggestion jolted my memory of a week ago. When I set only 4 relays (1 to 4) using Setpin, the IR code was received OK. With the full 24 outputs set it was not received. I just tried it with 4. It worked properly. It's a place to start looking. Will investigate yours too, Phil99. Thanks. |
||||
Turbo46 Guru Joined: 24/12/2017 Location: AustraliaPosts: 1642 |
Do you have any OPTIONs set that may interfere with setting any pins? OPTION LIST Bill Keep safe. Live long and prosper. |
||||
| LouisG Senior Member Joined: 19/03/2016 Location: AustraliaPosts: 129 |
No. Option List is empty. Some more info. I think I've narrowed it down. Apply Setpin DOUT only for relay outputs 1-4, IR code received OK Apply Setpin DOUT only for relay outputs 1-5, IR code NOT received. Apply Setpin DOUT only for relay outputs 6-24, IR code received OK So Relay 5 output is the culprit. Another observation: Output 5 outputs 3.3V on powerup. However, when made a DOUT on its own, the 3.3V disappears and the pin behaves normally when set to logic 1 or 0. This could be a defect. I have another Pico with the same Output 5 (GP3) doing the same thing. Will try to reorganise pin allocations to get it working or get a new Pico. Thanks everyone for nudging me towards a solution. |
||||
| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6283 |
Good to see you making progress. It would be interesting to see if you can use pin 5 as the IR receive and pin 32 as an output. Jim VK7JH MMedit |
||||
| phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2642 |
Tested 2 Picos freshly flashed with the latest 5.07.06RC1. GP0 to GP5 all just a few mV. Could the 3V3 be leakage on the breadboard? Measure that position with the Pico removed. Or try with the Pico in a different place on the breadboard. |
||||
| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 5090 |
Hi LouisG, Noticed you have a "dummy entry" in your array: DIM INTEGER Relay(24)=(-1, Picomite has a nice way to avoid this: OPTION BASE 1 When using this option the lowest index into the array changes from the default "0" to "1". Regards, Volhout PicomiteVGA PETSCII ROBOTS |
||||
| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10315 |
Unplug the Pico from the breadboard and just wire the IR receiver with flying wires then test. As Phil says there should be no voltage on pins as powered up |
||||
| LouisG Senior Member Joined: 19/03/2016 Location: AustraliaPosts: 129 |
Matherp and Phil proved to be spot on. I removed the Pico and was astonished to measure a bridge from Pin 6 to Pin 35 on the Vero proto board. All fixed now. Thanks Guys. - |
||||
 Print this page |
 |
The Back Shed's forum code is written, and hosted, in Australia. | © JAQ Software 2025 |
