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Ez make oven smd reflow
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Ez make oven smd reflow

by fmezzoiuso on Sun Nov 28, 2021 1:11 am

Project: EZ MAKE Oven on Adafruit site

I have all code running on the pyportal. All connections are good, Everything works great except when it time for digital pin (D4 port) connected to powerswitch tail to actuate relay. Led is dim on powewrswitchtail. No relay switching. output of the d4 connection white+ black- wires 3.25v when code initiates digital pin. Powerswitch tail tested using a small power supplying 3-5v. works. All firmware is the the latest cicuitpython and latest lib files. Any solutions to my issue? Thanks

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Re: Ez make oven smd reflow

by mikeysklar on Mon Nov 29, 2021 7:20 pm

Can you post some photos of your setup and any soldering you have done? It sounds like you are really close. It is odd you are getting a 3.25 instead of 3.3v reading.

Did you have to make the i2c mod to the MCP9600 to run at 3.3v?

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Re: Ez make oven smd reflow

by fmezzoiuso on Mon Nov 29, 2021 9:39 pm

The board with the mcp9600 i2c module plugged in and the voltage jumper set on 5v did not work, I cut trace and set it to 3 as mentioned, Board boots up. All code working properly. The digital pin responds to code and reads 3.25 volts. The issue i have is the switchtail led is dim and is not switching relay, the only soldering that was done was on the back of the pyportal voltage trace to 3 and the pins on the mcp9600 board. Opto isolator(moc3063) in the switch tail has a 5ma led trigger listed in the datasheet. 3.25v/470ohms is 6.9ma which should be sufficient to trigger opto isolator. The 470ohm resistor is part of the circuit inside the switch tail connected to the ssr. Thank you for all your responses.
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fmezzoiuso
 
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Re: Ez make oven smd reflow

by mikeysklar on Tue Nov 30, 2021 3:53 pm

Can you post an additional photo of the D4 3-pin connector with the two wires going to the power relay and the third unused red cable? I'd like to finish the review of the wiring before we move on.

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Re: Ez make oven smd reflow

by fmezzoiuso on Wed Dec 01, 2021 8:48 pm

uploaded pics
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fmezzoiuso
 
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Re: Ez make oven smd reflow

by mikeysklar on Thu Dec 02, 2021 1:38 pm

Thank you for the additional pics.

Since this is an earlier PowerSwitch Tail we need to make sure that you are using the 1 and 2, but not the 3rd right most connection. I can't quite see the black on black on the side. Can you confirm you are using the 1 / 2 pins on the PowerSwitch Tail and not the third labeled GND? example image from a different Pi based guide.

powerswitch-tail.png
powerswitch-tail.png (322.38 KiB) Viewed 148 times

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Re: Ez make oven smd reflow

by fmezzoiuso on Thu Dec 02, 2021 9:41 pm

I am using the first two and not the ground
In + in- only. I measured the voltage across those two connections(1.7v) connecting to a ssr same. Voltage drops to 1.7 and does not trigger the gate. Thanks..looking for your reply and or recommendations.

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Re: Ez make oven smd reflow

by mikeysklar on Sat Dec 04, 2021 7:00 pm

Yeah, that 1.7v out will not do. What are you powering the board with?

Are you using a PyPortal Pynt or Classic? I know the Pynt has D3 and D4 swapped.

When you move the connector to D3 (the other 3-pin plug on the board) do you see any voltage output? If you have a classic PyPortal board can you change the example code the use D3 and see if that works for getting the correct voltage?

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