Elektor claim that they have a nixie watch project starting next issue... On Sunday, 11 October 2020 at 16:23:39 UTC+1 [email protected] wrote:
> 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 <[email protected]> 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 [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/cac72b66-c447-4214-ac4e-04026f659880n%40googlegroups.com.
