generating 10-100 HZ with picmicro

Hi !
I need hardware suggestions for my test project.
I want to generate 10-100 HZ range thru picmicro but i need schematics on how to connect. The picmicro that am using is 16F914 and i will use internal osc.

The output of the mcu pin should be connected to small coil (coil outputs are connected together so u have just one wire coming out of the coil).

How should i make connection to the mcu and which other parts do i need (resistors etc. ), for generating those freq. per program.

If someone has some schematics on this, that would be great !

Thank you in advance !

Search for Tom Napier NCO design

It works, really!

Hi,
Please clarify my doubts
1. Which PIC r u using?
2. What wave do u want to generate , a sqaure wave?
Thanks

using sin looking table to generate SPM

Which PIC r u using?

Click to expand...

16F914 -- Microchip with nanotech.

What wave do u want to generate , a sqaure wave?

Click to expand...

sin wave.

I need to change the frequency on the fly, so there could be some problems with desing...or not ?

You can generate this frequency using DDS.
Example with PIC https://www.min.at/prinz/oe1rib/DDS/SineDDS.htm or with AVR **broken link removed**. Fore more info search on google for DDS

You can generate this frequency using DDS.

Click to expand...

Did you try to make something like this and is this working ?

hi whats u r ultimate aim. if u want to generate that frequency u can use softawre PWM so that u can vary the ON time

Hi,
16F914 is good enough to do ur project. Hav u completed ur circuit design?
Otherwise u hav to select a DAC for ur application. When selecting a DAC u hav to look for these parameters
1. Interface: Parallel or serial (If u r slecting Serial DAC then u hav to choose SPI or I2C interface, because both modules r present in ur MCU. I prefer selectting SPI)
2. Resolution: 8-bit DACs are enogh for ur requirement, also coding is easy
3. Speed: In ur application speed is not an issue
4. Output: Current or Voltage ( I prefer Voltage Output. In current output u hav to use an opamp circuit in the output to convert to voltage)
5. Channels: Number of output channels u need is one, i think, so go for one channel

I prefer MAX522 which is a 2 channel DAC

Check this link for more selections for DAC
**broken link removed**

After Designing ur circuit u hav to use a lookup table of sin values. above 150 values gives better THD. that is <1
In ur program u hav to send these values one by one with a particular DELAY.
Ur frequency of the wave depends on the DELAY time.

Please ask me if further help is needed

Thanks
Gladis