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Burngate
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Re: Controlling homemade solenoids using Rpi Z W

Mon Jul 16, 2018 5:30 pm

PiGraham wrote:
Mon Jul 16, 2018 1:41 pm
According to https://toshiba.semicon-storage.com/ap- ... 03APG.html the datasheet for that particular part number ...
Fixed that for you.

It's noteworthy that Toshiba is EOLing that part, and recommending TBD62003.
That uses a FET instead of a darlington, so has lower voltage when on.

PiGraham
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Re: Controlling homemade solenoids using Rpi Z W

Mon Jul 16, 2018 7:45 pm

Burngate wrote:
Mon Jul 16, 2018 5:30 pm
PiGraham wrote:
Mon Jul 16, 2018 1:41 pm
According to https://toshiba.semicon-storage.com/ap- ... 03APG.html the datasheet for that particular part number ...
Fixed that for you.

It's noteworthy that Toshiba is EOLing that part, and recommending TBD62003.
That uses a FET instead of a darlington, so has lower voltage when on.
Thanks.

The Toshiba part is end of life but other manufacturers make ULN2003A devices so they will probably be around for a while yet. People should always check the specifications of the actual device using the full part number.

The TBD2003APG should be OK. Input high 2.5V, but don't use the TBD2004APG which requires input 7V to turn on the output.

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Z80 Refugee
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Re: Controlling homemade solenoids using Rpi Z W

Mon Jul 16, 2018 9:34 pm

dibolero wrote:
Mon Jul 16, 2018 1:14 pm
I'm not sure if this a problem with the type of component we bought or a problem with the circuit diagram we're following.
Why not follow the circuit diagram I've given you, or the circuits in my hardware interfacing article?
Military and Automotive Electronics Design Engineer (retired)

For the best service: make your thread title properly descriptive, and put all relevant details in the first post (including links - don't make us search)!

dibolero
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Re: Controlling homemade solenoids using Rpi Z W

Tue Jul 17, 2018 11:13 am

We wanted to follow that however since you used an 8 pin darlington on the instructions we were scared we might mess up somewhere so we decided to look for one online. Luckily we've managed to make it work with a higher battery and we're now using 9V relays with a 9V battery instead. We didn't have resistors back when we tried it with the solenoid and 3v battery so it was most likely the voltage drop that stopped it from working.

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