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25
comment 1.8v GPIO controlling 5v 10mA solid state relay
However, when getting that part right, I can only measure 1.3uA from the GPIO port and barely 0.1uA for the relay when the GPIO is high. Relay's still not lighting up...
Jan
25
comment 1.8v GPIO controlling 5v 10mA solid state relay
Thanks for this great explanation! Cleared all my questions about transistors too!
Jan
25
comment 1.8v GPIO controlling 5v 10mA solid state relay
Oh shoot. Why the hell did I connect it to ground? Been thinking too much I/O lately. Thanks a million for noticing!
Jan
25
accepted 1.8v GPIO controlling 5v 10mA solid state relay
Jan
25
comment 1.8v GPIO controlling 5v 10mA solid state relay
@OliGlaser i.imgur.com/VGEAs.jpg
Jan
25
comment 1.8v GPIO controlling 5v 10mA solid state relay
@OlinLathrop I'm not sure. I was unable to find a specification, but that's what I measured. I followed this answer and got it working for a small IC, but the relay requires more current to work than what that circuit provides.
Jan
25
asked 1.8v GPIO controlling 5v 10mA solid state relay
Jan
17
awarded Supporter
Jan
17
comment 1.8V to 5V, still not comfortable with transistors
Thanks for all your help! Turns out I hadn't looked carefully enough on the datasheet and turned my transistors wrong.
Jan
12
comment 1.8V to 5V, still not comfortable with transistors
Oh, I thought you meant I had to ground something permanently for it to work correctly. I'll try that out, thanks!
Jan
12
comment 1.8V to 5V, still not comfortable with transistors
How do you mean "Ground Gumstix input to transistor emitter with piece of wire."?
Jan
12
comment 1.8V to 5V, still not comfortable with transistors
So I've put together your first suggestion but have run into some problems. The high levels of the outputs are 5V when the input is 1.8V. However: when the low levels of my GPIO-ports are 0V, two different outputs after amplification gives me 2V and 1.2V respectively as low-level! Have I broken the transistors somehow? i.imgur.com/7Qbhc.png
Jan
11
comment 1.8V to 5V, still not comfortable with transistors
I still don't quite get the resistor part. If I want multiple copies of this circuit, do I need two resistors for every transistor like this, or can I just do it like this?
Jan
11
awarded Supporter
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