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Post by eloute on Jan 21, 2021 4:44:04 GMT 2
Hey guys,
I just finished soldering up my second board. I have all the correct resistors, all the capacitors and dip sockets installed onto my board. The soldering job on this one is much better than the last board and I am still not getting any power to my displays. This is perplexing to say the least. I am using a proper 5v power supply. My 7 segment displays are all common cathode. The max chips are all facing the right way. all this and I am not getting any results.
My first board, sure... I made a few errors especially with the max7219cng chip orientation. This board, even the sockets were soldered correctly.
Now I don't know how sensitive these chips are or the likelihood they are all bad, but I have tried 20 chips on Com1 active then again all on Com1 standby and nothing.
if I attach my multimeter to the voltage pin and the ground of each max7219 chip, I do get a reading of 5v. All the capacitors give me the same reading. All the resistors give me the correct resistance but I get nothing when I check the led sockets (I used sockets this time around) There is no way I Effed up two boards.
Any ideas?
Regards,
Ed
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bosal
New Member
Posts: 42
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Post by bosal on Jan 21, 2021 10:44:11 GMT 2
Use Mobiflight, Airmanager did'nt worked for me.
Be sure to mount all arduino's and connect all the flatcables!! The common GND from the Encoders Radio Ardiuno, wich is absolutly needed for the displays, is not available on the Encoders Radio flatcable. The GND from Radio Encoders Arduino is routed through the PCB to the other flatcables.
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bosal
New Member
Posts: 42
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Post by bosal on Jan 21, 2021 10:54:29 GMT 2
Also buy good quality MAX chips, I buyed super cheap ones from Aliexpress but they didn't work. Then buyed new ones from lcsc.com/ and solved the problem! |
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Post by eloute on Jan 21, 2021 16:51:07 GMT 2
Also buy good quality MAX chips, I buyed super cheap ones from Aliexpress but they didn't work. Then buyed new ones from lcsc.com/ and solved the problem! Thanks Bosal, Which ones did you buy? There are a couple different ones ranging from $1.50 to $5 each Thanks, Ed |
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bosal
New Member
Posts: 42
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Post by bosal on Jan 21, 2021 17:47:53 GMT 2
I buyed the MAX7219CNG+ from Maxim Integrated, they work perfect!
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Post by eloute on Jan 21, 2021 18:10:07 GMT 2
I buyed the MAX7219CNG+ from Maxim Integrated, they work perfect! Thank you Bosal, I just ordered 20. Hopefully this is what it needs. I seriously cant see it being anything else. I just looked at the reviews for the knockoff chips I have and there are people complaining about them. There is one guy who tested 50 of them and they all shorted on pin 1. Fingers crossed... These genuine Maxim chips were $130cdn (with shipping) Ed |
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Post by AlbEagle on Jan 21, 2021 21:24:29 GMT 2
I am sorry to hear that, let's hope it was the max chips as i don't see anything else if you have soldered them correctly. I ordered my chips on ebay or aliexpress (a while ago) and they all worked for me. I could have taken one that works on my radio and send it to you so you know if thats the problem before ordering those. Maybe that wouldn't be your best solution as I don't know how long it would take to arrive. I have a question though, there is a switch on the back soldered to the 5v input, did you solder it as there you provide the board with 5v.
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Post by eloute on Jan 21, 2021 23:11:45 GMT 2
I am sorry to hear that, let's hope it was the max chips as i don't see anything else if you have soldered them correctly. I ordered my chips on ebay or aliexpress (a while ago) and they all worked for me. I could have taken one that works on my radio and send it to you so you know if thats the problem before ordering those. Maybe that wouldn't be your best solution as I don't know how long it would take to arrive. I have a question though, there is a switch on the back soldered to the 5v input, did you solder it as there you provide the board with 5v. Hi AlbEagle, Thanks for the response. I did solder the small switch for the 5v power switch. It does work as I tried it when I was measuring the voltage on the board with my multimeter. Either way, if the chips were the problem and these original ones work, It'll all be worth it to me. This is a fantastic project and I really want it to work. |
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kklee6
Junior Member
Posts: 87
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Post by kklee6 on Jan 22, 2021 5:35:39 GMT 2
Hey guys, I just finished soldering up my second board. I have all the correct resistors, all the capacitors and dip sockets installed onto my board. The soldering job on this one is much better than the last board and I am still not getting any power to my displays. This is perplexing to say the least. I am using a proper 5v power supply. My 7 segment displays are all common cathode. The max chips are all facing the right way. all this and I am not getting any results. My first board, sure... I made a few errors especially with the max7219cng chip orientation. This board, even the sockets were soldered correctly. Now I don't know how sensitive these chips are or the likelihood they are all bad, but I have tried 20 chips on Com1 active then again all on Com1 standby and nothing. if I attach my multimeter to the voltage pin and the ground of each max7219 chip, I do get a reading of 5v. All the capacitors give me the same reading. All the resistors give me the correct resistance but I get nothing when I check the led sockets (I used sockets this time around) There is no way I Effed up two boards. Any ideas? Regards, Ed HI eloute, That's really frustrating. I also ordered those cheap MAX chips from China. It costs about US$1.5 each. Luckily they work fine. Good luck with your new MAX chips and hope that your project goes well. KK |
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