Hi team, does the Pololu Dual VHN5019 motor driver shield have an idle time function, because after about 5 mins without an input my motor controller stops working?
On initial power everything works well, only after 5 mins of no input do I have some problems.
I am controlling the motor driver via a RASPI from my laptop running a python program.
I have included the script, do you have any ideas what could be causing my problem.
#import subprocess
#subprocess.check_call([“python”, ‘-m’, ‘pip’, ‘install’, ‘numpy’])
import pygame
import numpy as np
import socket
import sys
import paramiko
ssh_client = paramiko.SSHClient()
ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh_client.connect(hostname=‘169.254.222.19’,username=‘pi’,password=‘raspberry’)
stdin,stdout,stderr=ssh_client.exec_command(“sudo python3 server.py”)
ssh_client.close()
client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client.connect((‘169.254.222.19’,5555))
pygame.init()
display_width = 800
display_height = 600
black = (0,0,0)
white = (255,255,255)
red = (255,0,0)
green = (0,255,0)
blue = (0,0,255)
logoImg = pygame.image.load(r’logo.png’)
gameDisplay = pygame.display.set_mode((display_width,display_height))
pygame.display.set_caption(‘Control Module’)
clock = pygame.time.Clock()
gameDisplay.fill(white)
gameDisplay.blit(logoImg,(0,0))
pygame.draw.rect(gameDisplay, red, [100, 500, 100, 100])
pygame.draw.rect(gameDisplay, red, [300, 500, 100, 100])
myfont = pygame.font.SysFont(“monospace”, 15)
leftEngineLabel = myfont.render(“Left Engine”, 1, blue)
rightEngineLabel = myfont.render(“Right Engine”, 1, blue)
joysticks = []
for i in range(0, pygame.joystick.get_count()):
joysticks.append(pygame.joystick.Joystick(i))
joysticks[-1].init()
print(joysticks[-1].get_name())
crashed = False
#left engine bar based at (100,500)
#right enggine bar based at (300,500)
valaxis0 = 0
valaxis1 = 0
right_engine = valaxis1
left_engine = valaxis1
while not crashed:
gameDisplay.fill(white)
gameDisplay.blit(logoImg,(0,0))
AR = 0
AL = 0
if valaxis1>0:
if valaxis0>0:
AL = 1-valaxis0
AR = 1
else:
AL = 1
AR = 1+valaxis0
else:
if valaxis0>0:
AL = 1
AR = 1-valaxis0
else:
AL = 1+valaxis0
AR = 1
AR = ARvalaxis1
AL = ALvalaxis1
PV = valaxis0
PVS = 1-abs(valaxis1)*1
AL = (1-PVS)AL - PVSPV
AR = (1-PVS)AR + PVSPV
gameDisplay.blit(leftEngineLabel, (100, 80))
gameDisplay.blit(rightEngineLabel, (300, 80))
pygame.draw.rect(gameDisplay, red, [100, 350, 50, int(200*AL)])
pygame.draw.rect(gameDisplay, red, [300, 350, 50, int(200*AR)])
#displaying engines PWM duty cycle
leftEnginePWM = myfont.render("PWM:"+str("{0:.2f}".format(100*abs(AL)))+"%", 1, blue)
rightEnginePWM = myfont.render("PWM:"+str("{0:.2f}".format(100*abs(AR)))+"%", 1, blue)
gameDisplay.blit(leftEnginePWM, (100, 100))
gameDisplay.blit(rightEnginePWM, (300, 100))
#displaying engines direction
leftEnginePWM = myfont.render("Direction:"+str(-np.sign(AL)), 1, blue)
rightEnginePWM = myfont.render("Direction:"+str(-np.sign(AR)), 1, blue)
gameDisplay.blit(leftEnginePWM, (100, 120))
gameDisplay.blit(rightEnginePWM, (300, 120))
clockR = int((-np.sign(AR))>0)
clockL = int((-np.sign(AL))>0)
counterclockR = int((-np.sign(AR))<0)
counterclockL = int((-np.sign(AL))<0)
pwmR = int(100*abs(AR))
pwmL = int(100*abs(AL))
for event in pygame.event.get():
#print(event)
if event.type == pygame.QUIT:
crashed = True
elif event.type == pygame.JOYAXISMOTION:
if event.axis == 0:
valaxis0 = event.value
if event.axis == 1:
valaxis1 = event.value
elif event.type == pygame.JOYBUTTONDOWN:
if event.button == 7:
counterclockR = 2
counterclockL = 2
pwmR = 2
pwmL = 2
clockR = 2
clockL = 2
crashed = True
#kill the engine
#print(event)
#sending data to the server on the raspberry
send_bytes = str(clockR)+','+str(counterclockR)+','+str(pwmR)+','+str(clockL)+','+str(counterclockL)+','+str(pwmL)
send_bytes = send_bytes.encode()
send_bytes += b'\x00'*(256-len(send_bytes))
client.sendall(send_bytes)
pygame.display.update()
clock.tick(30)
pygame.quit()
quit()
