Thanks David. Indeed that is your code as I had mentioned, it's really helping me picking up pic assembly for this purpose. And the chip I'm working on is PIC16LF1519 as you use it in your NWLD5 (http://www.cathodecorner.com/nwl/NWLD5schem.pdf).
What I had found confusing was that the battery voltage input is on AN5 and so I thought you'd select channel 5, instead it only works on channel 4. I can see now it's probably because there is no ADC on bit 4 of ANSELA. I had connected Z of the ADXL to AN4 (pin21) and I couldn't record an ADC conversion. I can see now why! Oops.. movlw B'01110010' ; internal RC oscillator, AN3 Vref movwf ADCON1 movlw B'00111011' ; AN0, AN1, AN3, AN4, AN5 are analog movwf ANSELA You are right, you don't need X-Y-Z for the motion detection and it would use more power for no reason but I wanted to try and set the time using the accelerometer instead of the buttons. It may not be a good idea, it will still be a good learning exercise for me. Best regards, Max Il giorno sabato 10 ottobre 2020 alle 06:54:57 UTC+1 nixiebunny ha scritto: > Max, > > Hi. I wrote all that code. > > The NWR watch that I designed uses all the capabilities of the > PIC16LF722 chip. It was carefully engineered to do exactly what it > needs to do and nothing more. Every pin does useful work, some of them > doing two or three jobs at once. It has absolutely zero room for extra > features. > > If you need to read all three axes of the accelerometer (I don't know > why you would), then you need to use a PIC chip that has more pins. I > used such a chip to make the NWL watch. It uses an additional analog > input to read the battery voltage. > > I'd suggest starting with that deign if you want to add capabilities. > > On 10/9/20, Max DN <flata...@gmail.com> wrote: > > Hi all, I hope you are well and healthy. > > > > This little project is progressing really well, although not as quick as > > I'd like to have the time to... I got it all working and it's nice and > > smooth. However I do have a piece of code which I'm confused about and I > > was hoping that better trained eyes could help. > > > > The code that I'm using (verbatim from here for now: > > http://www.cathodecorner.com/nwl/nwld1.asm.txt, that is helping me to > learn > > > > PIC assembly so to write my own code later on) is doing analog conversion > > of outputs of the accelerometer ADXL335 (datasheet here > > > https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL335.pdf > ) > > > > to sense motion / tilt of the wrist. It works beautifully and it's very > > reliable, coded by DF of Cathode Corner on the X-Y axis (he's also done > it > > on Z-X on another project, so Z should work well on this sensor). My > issue > > is that I have moved the chip such that I need to use Z-X instead of X-Y > as > > > > in the code. Now that should be an easy code edit... Problem is that I > can > > see the correct mV changes on X-Y-Z on the chip and all pins are > > individually well connected to the PIC but somehow the PIC ADC isn't > > picking up Z, so I'm thinking I'm doing something wrong with the channel > > selection. > > > > Schematic here, except pin 8 Z-ADXL which I have actually connected to > pin > > 21 RA4 of the PIC): http://www.cathodecorner.com/nwl/NWLD5schem.pdf > > > > X-ADXL connected to AN1 -> So here I should select ADCON0 CH0=1 CH2=0 > > Y-ADXL connected to AN0 -> So here should be ADCON0 CH=0 CH2=0 (X and Y > > seem switched in the code but given some logic later on, it's fine, no > > issues so far). > > Z-ADXL connected to AN4 -> So here I should select ADCON0 CH0=0 CH2=1 > (but > > when I do that... it doesn't work, I get 0 voltage sensed, odd) > > Voltage monitor (resistive divider) connected to AN5 -> now this is odd > as > > I would have expected to select ADCON CH0=1 and CH2=1 but it works only > > with ADCON0 CH0=0 and CH2=1 (so this is confusing to me! I don't > understand > > > > why this works only on channel 4 when it's actually connected to channel > 5 > > and portA is set as '00110011' (2 and 3 being outputs) with '00110011' > > (AN0, AN1, AN4, AN5 being analog inputs). > > > > Am I missing the obvious elephant in the room? Relevant code below (full > > code in the link above). I'd appreciate if anyone has 5 mins to spare to > > look into this please. > > > > Thank you, > > Max > > > > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/44e535ab-0b48-4488-8720-7cddc202c779n%40googlegroups.com.
