Breakout board pinout low/high state problem

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Amolpploma
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14 Oct 2023 01:08 #282953 by Amolpploma

Breakout board pinout low/high state problem was created by Amolpploma

Hi everyone. I'm facing a strange problem with my Chinese bob (the one with a blue relay). I wired pin 16 as the signal to a relay module that controls spindle CCW movement through VCD. The CW movement is controled by the onboard relay. Strangely, when I turn on the PC, both relays are trigged. Before the end of the startup messages, the built-in relay turns off but the relay connected to pin 16 remains on. Only when I launch linuxcnc the relay module is turned off and both relays start working as expected (M3/M4/M5) . I assumed that all pinouts should maintain the low state until trigged, right? Any suggestions to resolve this issue? Thank you.

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tommylight
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14 Oct 2023 01:42 #282959 by tommylight

Replied by tommylight on topic Breakout board pinout low/high state problem

Short of using a charge pump, there is no solution.
Parallel port changes states of pins during boot, it was used for diagnosing stuff on PC's.
You can however use another pin that might not change states, but you have to test other output pins to be sure.

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COFHAL
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14 Oct 2023 01:49 - 14 Oct 2023 01:50 #282960 by COFHAL

Replied by COFHAL on topic Breakout board pinout low/high state problem

Work fine.
Just found this amazing item on AliExpress. Check it out! Please help me choose!
$8.71 35%OFF | MACH3 charge pump module / MACH3 delay control module / 2 pulse delay control sensor
a.aliexpress.com/_m04XtuI

Last edit: 14 Oct 2023 01:50 by COFHAL.

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tommylight
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14 Oct 2023 10:35 #282977 by tommylight

Replied by tommylight on topic Breakout board pinout low/high state problem

Link does not work:
Sorry, the page you requested can not be found:(
That is what it says.

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COFHAL
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15 Oct 2023 01:04 - 15 Oct 2023 01:06 #283025 by COFHAL

Replied by COFHAL on topic Breakout board pinout low/high state problem

a.aliexpress.com/_mNs0l1u

Last edit: 15 Oct 2023 01:06 by COFHAL.

The following user(s) said Thank You: tommylight

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tommylight
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15 Oct 2023 01:30 #283026 by tommylight

Replied by tommylight on topic Breakout board pinout low/high state problem

Same thing, does not work for me as it redirects me to the German site.
Thank you.

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Amolpploma
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15 Oct 2023 10:35 #283050 by Amolpploma

Replied by Amolpploma on topic Breakout board pinout low/high state problem

Thanks for your help guys.

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tommylight
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15 Oct 2023 12:06 #283060 by tommylight

Replied by tommylight on topic Breakout board pinout low/high state problem

Charge pump is easy, some capacitors, a resistor and a transistor.
The problem is, if you search for charge pump on the internet you get bombarded with "voltage multipliers" named as charge pump, so not easy to find at all.

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