Basically, if it reads the ADC and you have a value more than 229, it will increase the PWM to lower the ADC value, if it reads the ADC and has lower than 229, it will decrease the PWM to compensate (or raise) the ADC value until it gets 229.

your compilation, does it give you the expected value?? when im computing the program with "pwmout 2,109,220" i got the voltage boost at the output, but then when im decreasing the input voltage, just the magnitude changes, but not the duty cycle, neither increase or decrease. i decrease the input voltage many times, when i got to a certain value ard 1.6v, i got nothing at the duty cycle, its like a very noisy signal or shows you zero.

ichange the cv value, but still.
now when using a duty variable as "pwmout 2,109,duty" it doesnt boost anymore. when getting the pwm code using the calculation wizard for a 9.1KHz, "pwmout 2,109,220 " it really does boot.

i changed also the B1 to B0,as said by the compiler.

dont know why it doesnt working. maybe i dont do it properly , bt i dt know.

hi tony

did u have a look at the code again??

tnx.

emerson sorry ive been pretty busy. ill look at the code for you and get back to you asap.

thanks.

hi

its fine i noticed it.plzz im presenting on monday, and the code still not working . i will be online the the whole to wait ur reply plzzzz.

tanx.

hey ,

want to ask you !!!! there is something very strange that i noticed, u see the voltage divider that i connected at the output. i want to put 3.5V as reference at my ADC when i got 12V output. i did the calculation and everything, and i put the resistor. now, connecting everything, when i got 12V output, i got 1.5V at my ADC. which is not the value that im supposed to get. i checked eerywhere its fine. so wat do u think?? is from the picaxe????

tanx.

hey,

hope ur fine. the gud news is im almost done, i will upload some pics there so u can see.however i still have some problems, especially to regulate the output at 12V.I would like to fix my reference input voltage at 3.5V.

meaning for vin =8.8V, duty cycle is 50% and we have expected voltage which is 13V. this part i got it, its working well, my duty cycle is increasing well.

lets say the Voc of the cell is decreasing (cloud). so for 3.5V<=Vin<8.8, i would like the duty cycle to increase the duty cycle linearly, so we can always have the max output voltage. do u know how we can do this part??? ive got some idea, but the programming part will kill me.

i read some stuff from someone abt an easy way to get MPP saying " best way to optimise this is to put a load on the output, feed in fixed volts and measure the maxiumum volts you can get on the output. And that usually is around a 50:50 duty cycle. That gives you the maximum efficiency - and then rather than change the duty cycle, it usually works out more efficient to turn the entire oscillator on and off to regulate the output." How do we turn the entire oscillator on and off to regulate the output??? do u understand wat it means by that?? how is it gonna be in a programming way???

tanx.

hi tony !!

ru still ard?? didnt hear much 4m u lately