I am facing an issue while controlling a 12 volt DC geared motor via L293DNE motor driver.
below are my findings
No.
INPUT to Motor Driver
OUTPUT from Motor Driver
Voltage measurement @ Motor end
Behavior
1.
5.20 volt
11.45 volt
10.52 volt
Expected
2.
4.48 volt
3.38 volt
3.98 volt
Unexpected
I am unable to trace this out, that what makes this drop in voltage using my circuit '2', where in when I use circuit '1' DC motor works perfectly fine. I am using L293dne driver for controlling DC geared motor as well providing amplified voltage i.e. 12 volts; because voltage coming from my circuit '2' is approximately 5volts but I need to give my DC motor 12 volts for heavy use.
Is it possible that due to drop in Input voltage i.e. from 5.20 to 4.48 the issue is coming?
I am fairly new to electronics. Any help is appreciable.
I'm confused because both lines are number "1".... but that aside, the 293 chip does lose about 2V (I forget the exact value, 1.8 maybe?) between your input and its output. Not clear from your tables and description if that's what you're talking about.
Sorry but we need proper diagrams with the 293 pins shown and what's connected to each one as an input or output. I really don't get what you're describing right now....
There must be more connections to the 293 than those.... where's the 5V logic supply on 293 pin 16 and whatever voltage the motor needs on 293 pin 8. Where's the 5V on 293 pin 1 to enable out 1 and out 2 on 293 pin 3 and 6?
You need to show everything for us to understand. If you ARE showing everything already it won't work and I think any output is coincidental.
I recommend checking your vero board circuit for any incorrect wiring, short circuits etc. Use your multi-meter to check connections.
You're probably better off using conventional vero board, rather than a board that requires you to manually link strings of holes together.
It's also impossible to see your wiring photo properly, due to the photo resolution being too low.
Your drawing reckons that pins 4, 5, 12 and 13 should all be connected to GND. So use your multimeter and make sure that these are actually connected to GND.
Also, it appears (in your photo) that your pin 16 is connected to 'GND', but pin 16 is actually meant to be connected to positive supply voltage (5V DC)...... not meant to be connected to GND.
bforu_gs: @southpark1
This circuit is working as expected in other cases, I usually use it with both output ends with two motors.
Let me know if you need further information
Thanks. Earlier, I was looking at your original image..... which indicated that pin 16 was connected to GND. But now, your 2nd uploaded 'corrected' photo is different. The corrected photo is looking better.
Use your multimeter to ensure that not only pin 4,5, 12, and 13 are connected together.... but also ensure that the negative side of your 5V DC and 12V DC supply terminals are indeed connected together (ie. connected to 4, 5, 12, 13).
I believe that they are connected from my power supply. Do I need to connect them here too?
regards,
Welcome. If the negative sides of each supply are already connected together.... then ok. Just use your multimeter in resistance continuity mode to see if they are connected.
