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the AT89c52 does not have the hardware pwm, spi & i2c. i recommend to use the similar version of AT89c51AC2 which has an inbuilt PWM. the solution is to implement software PWM, spi & i2c
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check this link might help with the information:
Tutorial on 8051 adc with lm35 **broken link removed**
Digital thermometer project: **broken link removed**
When you communicate in AT commands, you need to send an "AT" and enter (which is carrage return which is 0x0D) so that the gsm module would know that the packet have finished. **broken link removed**
al you need to do is a potential divider from the 5v to 3.3v (18k and 10k). while the 3.3v to 5v is accapted as it is since (logic high is less than 3.3v). Electronics & Control Engineering Projects | Electronics Blog | Electronics Downloads | Electronics Tutorials
Hi, i can give you this tutorial on PID which helps you alot and a link for some other links which have PID coding into a micrcontroller:
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You can check these two links with transmission from the PC (using c#) and receiving on the 8051 micro:
8051 uart: **broken link removed**
c# uart: **broken link removed**
you need to implement a controller to convert a dc motor to a servo motor. Check these tutorials on motors and PID control which might help:
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