16F876A Pulsin issues

[Bobbo_ZA]

just not getting the decimal places now, :-(

Latest attempt

ADCIN 4, volt                  ' Read AN4 into temp variable
volt = volt * 2
Vin = (5*volt/1023)
Vind = (volt // 1000) / 10 'millivolts?

lcdout $FE, $C0+8, dec Vin,".",dec2 Vind,"V"

Time to pack it in for the night, work tomorrow, fairly good progress, just the decimal points to figure out.

Kind Regards
Rob

[Bobbo_ZA]

Am I on the right track?

the "//" operator will store the remainder in the chosen Var, thus:

ADCIN 4, volt                  ' Read AN4 into temp variable
volt = volt * 2                 'Correct the ADCin for the Voltage divider?
FVolt = (5*volt/1023)
MVolt = (5*volt // 1023)  'millivolts?

lcdout $FE, $C0+8, dec FVolt,".",dec4 MVolt,"V"

Sorry for getting overly complex with this but trying to understand how it works, I have been able to simulate what I need to do in excel, just not sure if the above will work in PBP:

D1 = Vref @ 5.00
D5 = Adc Corrected @ 1021
D6 = 10 bit ADC @ 1024

D14 = Whole number (Formula =TRUNC(D9,0), result = 4
D15 = Remainder (Formula =(MOD((D5*D1)/D6,1)*1000)), result = 990

I could then LCDout D14, ".", D15 in theory if the formula in PBP equaled the excel result.

not sure though, still a bit confused

Cheers
Rob

[Acetronics2]

just not getting the decimal places now, :-(

Latest attempt

ADCIN 4, volt                  ' Read AN4 into temp variable
volt = volt * 2
Vin = (5*volt/1023)
Vind = (volt // 1000) / 10 'millivolts?

lcdout $FE, $C0+8, dec Vin,".",dec2 Vind,"V"

Time to pack it in for the night, work tomorrow, fairly good progress, just the decimal points to figure out.

Kind Regards
Rob

Ok Rob,

What about :

ADCIN 4, volt                  ' Read AN4 into temp variable

volt = volt * 2 * 5

Volt = 100*volt               ' See manual for DIV32 !!!
Vind = DIV32 1024           ' Here we have result in 1/100 Volts ...

Vin = Vind/100                  ' Here we get the integer part ...
Vind = Vind // 100             ' Here we get the decimal part ...

lcdout $FE, $C0+8, dec Vin,".",dec2 Vind,"V"

that's all !

[Bobbo_ZA]

Cant believe it can be that simple, i was trying to over complicate things, :-)

Will try it again tonight, :-)

Achievements So far:
1. Hitachi LCD interfaced to 16F876A
2. Read input from RC Receiver
3. Drive a Servo from the PIC
4. Display pulsin values on the LCD
5. Measure Flight Pack voltage - with load on demand

Still to do:
1. Menu system for each function
2. separate components into sub functions
3. Move off Breadboard and build into an enclosure of some sort.

List of proposed features:
1. Rc Flight pack battery tester
2. Servo Tester - with Sweep and Centering
3. Current monitor - planing to add either SI210709-300T (50A) or ACS750
4. Receiver Pulse monitor for other PIC projects
5. Thermometer - Although I think I'm all out of AD inputs
6. Sure Im going to come across some more features to add to it, :-) any ideas?

[Bobbo_ZA]

Hi Ace, All,

its working, :-) cant believe it was that simple, :-)

going to start working on the next phase of the implementation this weekend.

Hope everyone has a good weekend, :-)

Cheers
Rob