Hey Guys!
I decided to modify and old PC ATX Power Supply and use Arduino to show me the voltage output. I put in some banana plugs in different colors to give me 3.3V, 5V, -5V, -3.3V and -12V up to 12V (typical ATX voltages). Kinda like a Lab Power Supply.
Now I dedided to modify this thing to use the 12 V Output to give me constant voltage ranging from 1,5V to 12V. So I bought a LM317T, which handles it quite well. I put Arduino reading the voltages using a simple voltage divider circuit. Easy enough. There are 100eds of Tutorials on how to use the Arduino ADC this way. And the Lm317 Datasheet also gives some suggestions.
Long story short:
the circuit is working. I can adjust the voltage with a potentiometer (5k). I use Proteus to simulate the whole thing before putting it on the breadboard.
it doesn't bother me much that the voltages in Proteus are off (output goes from 1,5V to 13V) :-D and in the real circuit it ranges from about 1,5V to 10,70V. I'm fine with that as well.
Besides... I'm planning on modifying this whole circuit to be able to adjust the desired Output Voltage with my (barebones 328p) arduino (maybe some buttons or a rotary switch or sth).
So here are my questions:
HOW MUCH CURRENT will this circuit be able to supply? The LM317 Datasheet says it can handle "more than 1.5A".
And would you guys recommend a digital potentiometer (like the AD5204 or AD5206) and replace the potentiometer (RV1) in this circuit with that one (so i can control voltages with the arduino)?
Possible alternative would be the following (i guess):
From the LM317 Datasheet:
For this I have a few TIP120 Transistors or a lot of 2N3904.
What do you guys think?
I decided to modify and old PC ATX Power Supply and use Arduino to show me the voltage output. I put in some banana plugs in different colors to give me 3.3V, 5V, -5V, -3.3V and -12V up to 12V (typical ATX voltages). Kinda like a Lab Power Supply.
Now I dedided to modify this thing to use the 12 V Output to give me constant voltage ranging from 1,5V to 12V. So I bought a LM317T, which handles it quite well. I put Arduino reading the voltages using a simple voltage divider circuit. Easy enough. There are 100eds of Tutorials on how to use the Arduino ADC this way. And the Lm317 Datasheet also gives some suggestions.
Long story short:
the circuit is working. I can adjust the voltage with a potentiometer (5k). I use Proteus to simulate the whole thing before putting it on the breadboard.
it doesn't bother me much that the voltages in Proteus are off (output goes from 1,5V to 13V) :-D and in the real circuit it ranges from about 1,5V to 10,70V. I'm fine with that as well.
Besides... I'm planning on modifying this whole circuit to be able to adjust the desired Output Voltage with my (barebones 328p) arduino (maybe some buttons or a rotary switch or sth).
So here are my questions:
HOW MUCH CURRENT will this circuit be able to supply? The LM317 Datasheet says it can handle "more than 1.5A".
And would you guys recommend a digital potentiometer (like the AD5204 or AD5206) and replace the potentiometer (RV1) in this circuit with that one (so i can control voltages with the arduino)?
Possible alternative would be the following (i guess):
From the LM317 Datasheet:
For this I have a few TIP120 Transistors or a lot of 2N3904.
What do you guys think?