I used an h-bridge to reverse the current of a peltier plate, which was the same as this video

.

In the video, he had to physically remove a wire and place it somewhere else to reverse the current of a peltier plate. I was wondering how would I do it without removing a wire?

Also how do I control the current flow with an Arduino? In the image I provided, I figured out how to control the current with just the peltier itself without reversing current or anything

Would the circuit for the DC motor controlled by a L293NE h-bridge work if I just replace the DC motor with the peltier plate?

Source: https://itp.nyu.edu/physcomp/labs/motors-and-transistors/dc-motor-control-using-an-h-bridge/

 

L293NE probably not work it's only good for a 1 amp Continuous output current.

And that's on a pcb with heat sink made into it.
If you soldered it on a pref board you can't get a amp out of it.

Really need to know how big your peltier plate is.

That's not a good h-bridge for arduino you need to add some part's to insure that it don't power up and
have all 4 drivers on till your code is running.

 

I used an h-bridge to reverse the current of a peltier plate, which was the same as this video

.

In the video, he had to physically remove a wire and place it somewhere else to reverse the current of a peltier plate. I was wondering how would I do it without removing a wire?

Also how do I control the current flow with an Arduino? In the image I provided, I figured out how to control the current with just the peltier itself without reversing current or anything

Would the circuit for the DC motor controlled by a L293NE h-bridge work if I just replace the DC motor with the peltier plate?

Source: https://itp.nyu.edu/physcomp/labs/motors-and-transistors/dc-motor-control-using-an-h-bridge/

Yes, but make sure the h-bridge is rated to the peltier current. Most small motors would draw much less current.

 

L293NE probably not work it's only good for a 1 amp Continuous output current.

And that's on a pcb with heat sink made into it.
If you soldered it on a pref board you can't get a amp out of it.

Really need to know how big your peltier plate is.

That's not a good h-bridge for arduino you need to add some part's to insure that it don't power up and
have all 4 drivers on till your code is running.

Sorry I'm new to electronics, but is there a way to add a switch to switch from off, cold or hot, so I don't have to physically arrange the wires like the person did in the video

 

Yes post the circuit there just swapping the drivers base.
It can be done with the arduino but you got have the logic right need to see link to circuit.

L293NE works fine if your around a 1/2 amp but to get up to the 1 amp mark you have to have heat sink witch need see a datasheet for your cooler.

 

Yes post the circuit there just swapping the drivers base.
It can be done with the arduino but you got have the logic right need to see link to circuit.

L293NE works fine if your around a 1/2 amp but to get up to the 1 amp mark you have to have heat sink witch need see a datasheet for your cooler.

Ah sorry I don't have the schematic of the drawing since I just followed the guy in the video, but I'm not sure how I would incorporate a switch to manage off, cold or hot. I guess I'm scrapping the idea of controlling the temperature

Edit: Never mind the guy gave me his schematic! https://computerwizardlab.files.wordpress.com/2017/01/h-bridge-circuit.png?w=676

 

This is the data sheet it shows 6.4 amps for the cooler http://peltiermodules.com/peltier.datasheet/TEC1-12706.pdf
That kills the L293NE can't use it

 

This is the data sheet it shows 6.4 amps for the cooler http://peltiermodules.com/peltier.datasheet/TEC1-12706.pdf
That kills the L293NE can't use it

The IRLB8721PbF are not good for driving from a port pin of the arduino

Oh I won't be using an arduino anymore, but is there a way that I can add a switch instead so I don't have to physically adjust the wires for hot and cold? Here's a picture of the wiring, I am not sure where to put the switch, or what kind of switch I'd need. Thank you so much for your advice!

 

Not really much use to use the h-bridge just use a switch

 

Not really much use to use the h-bridge just use a switch

Would this work with a peltier plate too?

 

I reread the data sheet if you hooked it up like this using your IRLB8721PbF for the ones that are on there
you could use the arduino.

 

Yes they both work the dp-dt switch
or the h-bridge. I first though the IRLB8721PbF needed to much voltage to turn on but there 2.5 not 4.5
so the uno could switch them fine.

Just make sure your code doesn't set pin one and pin two high at the same time.
they need one low and one high at any giving time.

 

Yes they both work the dp-dt switch
or the h-bridge. I first though the IRLB8721PbF needed to much voltage to turn on but there 2.5 not 4.5
so the uno could switch them fine.

Just make sure your code doesn't set pin one and pin two high at the same time.
they need one low and one high at any giving time.

Again thank you so much for helping me!!!!!! I was wondering would the arduino circuit you provided above look similar if I just replaced the mosfet?

I have this basic circuit drawn out similar to yours, I'm also going to be powering the peltier plate with 12v and the arduino with 9v

 

The circuit I posted you have to use the IRLB8721PbF the one's in it are too small ,But all you do is use the IRLB8721PbF.

The Switch circuit will work too.

 

The circuit I posted you have to use the IRLB8721PbF the one's in it are too small ,But all you do is use the IRLB8721PbF.

The Switch circuit will work too.

View attachment 140337

Is Load the peltier plate? Sorry to ask again, what would the program look like roughly? Like this?

int peltier = 3; //The N-Channel MOSFET is on digital pin 3
int power = 0; //Power level fro 0 to 99%
int peltier_level = map(power, 0, 99, 0, 255); //This is a value from 0 to 255 that actually controls the MOSFET

void setup(){
Serial.begin(9600);

//pinMode(peltier, OUTPUT);
}

void loop(){
char option;

if(Serial.available() > 0)
{
option = Serial.read();
if(option == 'a')
power += 5;
else if(option == 'z')
power -= 5;

if(power > 99) power = 99;
if(power < 0) power = 0;

peltier_level = map(power, 0, 99, 0, 255);
}

Serial.print("Power=");
Serial.print(power);
Serial.print(" PLevel=");
Serial.println(peltier_level);

analogWrite(peltier, peltier_level); //Write this new value out to the port

}

 

You added to it LOl

IS the Load the peltier plate?

Yes

 

You added to it LOl

lol what do you mean? I don't see how your circuit will also reverse the current of the peltier plate :O? Sorry I am a complete noob

 

Something more like this
And try to use the code tag's its under the + button on the editor.

int cold = 3;
int hot = 5;
int power = 0; //Power level fro 0 to 99%
int peltier_level = map(power, 0, 99, 0, 255); //This is a value from 0 to 255 that actually controls the MOSFET
int val = 0;
void setup() {
  Serial.begin(9600);
  pinMode (cold, OUTPUT);
  pinMode (hot, OUTPUT);

}



void loop() {
  char option;

  if (Serial.available() > 0)
  {
    option = Serial.read();
    if (option == 'a')
      power += 5;
    else if (option == 'z')
      power -= 5;

    if (power > 99) power = 99;
    if (power < 0) power = 0;

    peltier_level = map(power, 0, 99, 0, 255);
  }

  Serial.print("Power=");
  Serial.print(power);
  Serial.print(" PLevel=");
  Serial.println(peltier_level);
  digitalWrite(hot, LOW);
  val = peltier_level;
  analogWrite(cold, val); //Write this new value out to the port
  digitalWrite (hot,LOW);
  // add here to change from cold to hot
}

 

Something more like this
And try to use the code tag's its under the + button on the editor.

int cold = 3;
int hot = 5;
int power = 0; //Power level fro 0 to 99%
int peltier_level = map(power, 0, 99, 0, 255); //This is a value from 0 to 255 that actually controls the MOSFET
int val =0;
void setup() {
  Serial.begin(9600);
  pinMode (cold, OUTPUT);
  pinMode (hot, OUTPUT);
}
void loop(){
char option;
if(Serial.available() > 0)
{
option = Serial.read();
if(option == 'a')
power += 5;
else if(option == 'z')
power -= 5;
if(power > 99) power = 99;
if(power < 0) power = 0;
peltier_level = map(power, 0, 99, 0, 255);
}
Serial.print("Power=");
Serial.print(power);
Serial.print(" PLevel=");
Serial.println(peltier_level);
digitalWrite(hot, LOW);
val = peltier_level;
analogWrite(cold,val); //Write this new value out to the port

// add here to change from cold to hot
}

You're a guru! Thank you so much, but the code I posted was just to control the current of this https://imgur.com/a/OIOA2

I am not sure how to breadboard your schematic, and reverse the current. Also in the code what component is connected to pin 5 of the arduino for the hot side?

 

Like these Im not to good with paint