The shape of square wave for PIC with soldering iron

[hugo]

I'd like to control the temperature of my soldering iron with a PIC micro and a solid state relay (DC input 5-30v ; AC out 220V,10A).
I need some advice about the shape (raport/ratio) of square wave that I'll have to generate with the PIC micro.

:? :? :?

Thanks!

 

[Dspnut]

Hi..there,
The following project by Mike Pearce may give you some idea. It's a phase controller for 2kW heater. The PIC microcontroller is 12C508. However, you need to modify the circuit of this project, in order to use your solid state relay.

https://www.microchipc.com/sourcecode/PIC_Hi-Tech_C_Mike_Pearces_phase_control.zip

HTH

 

[froggy]

I would recomend to use a PIC with PWM output, that way you
only has to set freq. and dutycycle in sw. (Very simple)

I would try out the freq for the application, but a good place to start is 0.5-5Hz in your application, since you need to go lower the main freq.
The wave form is of couse a simple square wave to control the relay, and the duty cycle is simply set to 0-100% dependig on the wanted output power.

If you need a ADC aswell I think 16F870 is a nice choice even if it's a huge overshot, but the advantage is ADC, PWM and the possibility to use a ICD for developing. You even have a serial port if you want to have a PC i/f

/Froggy

 

[ME]

I think you could get some inspiration from the PIC16F84 based TRIAC / IGBT phase controller for 50/60Hz brightness control project as well. It uses TRIAC / IGBT instead of solid state relay. I think this is a cheaper and better solution for your purpose.

https://www.microchipc.com/sourcecode/#triac

https://www.microchipc.com/sourceco...es_phase_controller_TRIAC_or_IGBT_50-60Hz.zip

Here is an interesting project for temperature monitoring and thermostat function:

https://www.microchipc.com/sourcecode/#ds1821

https://www.microchipc.com/sourcecode/PIC_Hi-Tech_C_Mike_Pearces_DS1821_thermostat.zip