Arduino analog pins

Susana · May 5, 2020, 8:16pm

Does anyone know how to write to the analog pins of the Arduino attached to the PYNQ Z1 ??

Im trying to control the power of a DC motor.
I also try to send instructions to a Servomotor but I have no response.

Thanks!

kuoyaoming93 · May 7, 2020, 1:37am

Hi!

Here you can find some examples using the Analog ports for Arduino shield connector.

github.com

Xilinx/PYNQ/blob/master/boards/Pynq-Z1/base/notebooks/arduino/arduino_analog.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Arduino Analog Example\n",
    "\n",
    "This example shows how to read out analog values on Arduino analog pins. Users can either wire the test pins, or use the PYNQ shield. \n",
    "\n",
    "For this notebook, a PYNQ Arduino shield is used. The grove joystick is connected to group A1, while a grove potentiometer is connected to group A4 on this shield."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],

This file has been truncated. show original

Susana · May 13, 2020, 4:41am

Thanks! but I would like to WRITE to Analog pins, I mean send values to the pines. Do you have an example for that ??

cathalmccabe · May 13, 2020, 6:41am

The Zynq chip in the Z1 has an ADC connected to these pins, so you can only read analog values, you can’t write them. If you want to write analog values you need a separate DAC.

You could get a Pmod DAC; example here:

github.com

Xilinx/PYNQ/blob/master/boards/Pynq-Z1/base/notebooks/pmod/pmod_dac_adc.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {
    "slideshow": {
     "slide_type": "slide"
    }
   },
   "source": [
    "\n",
    "# DAC-ADC Pmod Examples using Matplotlib and Widget\n",
    "\n",
    "----\n",
    "\n",
    "## Contents\n",
    "\n",
    "\n",
    "[Pmod DAC-ADC Feedback](#Pmod-DAC-ADC-Feedback)\n",
    "\n",

This file has been truncated. show original

Cathal

Susana · May 13, 2020, 5:24pm

Thanks Cathal!

I also try to write a PWM signal on the PMODA 0 pin and connect this to the motor.
I follow this link to write the code: PYNQ/pmod_timer.ipynb at master · Xilinx/PYNQ · GitHub

Do you know If I need too a separate component to get the output of the PMOD ?

I shared you my code:

from pynq.overlays.base import BaseOverlay
from pynq.lib.arduino import Arduino_IO

base = BaseOverlay(“base.bit”)

from time import sleep
from pynq.lib import Pmod_Timer

#this to enable the motor
ENA = Arduino_IO(base.iop_arduino.mb_info,6,“out”)

#Enable motor A
ENA.write(1)
#PMOD 0 pin to the PWM of the motor
pt = Pmod_Timer(base.PMODA,0)
pt.stop()

period=100
pt.generate_pulse(period)

Sleep for 4 seconds and stop the timer

sleep(4)
pt.stop()

marioruiz · May 13, 2020, 7:54pm

Hello @Susana,

This post PWM on PYNQ_Z2 to a motor may answer your question.

Mario

IsakVisini · May 14, 2020, 6:47pm

Hi…as per Arduino guidelines the analog pins are usually defined as D14, 15, 16, 17, 18, 19 for Analog0, 1,2,3,4,5.
Are you using the analog pins as analog or digital inputs?

ANUSHA_PINISETTY · April 5, 2022, 6:40am

Hello, i am working to convert analog signal into digital using the ADC on pynqz1. so can you guide me how should i connect the acoustic sensor to analog pins of adc?
thanks in advance…

ANUSHA_PINISETTY · May 5, 2022, 9:29am

hai… i am using analog pins to give an analog input and then it has to be converted into digital form using ADC and then i have to save it as a csv file into SD Card of pynqz1 and then use it further

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Arduino analog pins

Sleep for 4 seconds and stop the timer

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