New gertboard example & code.

gertboard_pump_code.py

@@ -0,0 +1,78 @@
+#!/usr/bin/python2.7
+from __future__ import print_function
+import wiringpi
+import pygame, sys, os
+from pygame.locals import *
+from time import sleep
+
+class motor_handler():
+    def __init__(self):
+        wiringpi.wiringPiSetupGpio()				# initialise wiringpi GPIO
+        wiringpi.pinMode(18,2)                      
+        wiringpi.pinMode(17,1)                     
+        wiringpi.digitalWrite(17,0)               
+        wiringpi.pwmWrite(18,0)                  
+    def motor_loop(self, stepSize,motorHold):
+		wiringpi.pwmWrite(18,stepSize)   			# pwmWrite(pinNum,StepSize)    	 
+		sleep(motorHold)
+		wiringpi.pwmWrite(18,0)
+    def reset_motor(self):
+        wiringpi.pwmWrite(18,0)                 
+        wiringpi.digitalWrite(18, 0)            	# ports 17 & 18 off
+        wiringpi.digitalWrite(17, 0)
+        wiringpi.pinMode(17,0)                  	# set ports back to input mode
+        wiringpi.pinMode(18,0)
+
+# Displays pump # every time the pump is run.
+class info_text_handler():
+    def __init__(self):
+        self.trialNumber = 0
+        self.fontObj = pygame.font.Font(None,24)
+    def trial_increment(self):
+        self.trialNumber += 1
+    def render_text(self, colorName, winSurface):
+        msg = 'Trial ' + str(self.trialNumber)
+        msgSurface = self.fontObj.render(msg, False, colorName)
+        msgRect = msgSurface.get_rect()
+        msgRect.bottomright = (200,100)
+        winSurface.blit(msgSurface, msgRect)
+    def trial_reset(self):
+        self.trialNumber = 0
+
+def main():
+    pygame.init()
+    pygame.mouse.set_visible(0)
+
+    fpsClock = pygame.time.Clock()
+    winSurface = pygame.display.set_mode((400,200))
+    pygame.display.set_caption('Gertboard Pump')
+
+    red = pygame.Color(255,0,0)
+    black = pygame.Color(0,0,0)
+    winSurface.fill(black)
+
+    infotext = info_text_handler()
+    motor = motor_handler()
+
+    while True:
+        for event in pygame.event.get():
+            if event.type == QUIT:
+                motor.reset_motor()
+                pygame.quit()
+                sys.exit()
+            elif event.type == KEYDOWN:
+                if event.key == K_w:										# press "w" to run the pump
+					winSurface.fill(black)
+					infotext.trial_increment()								# increment the trial number	
+					infotext.render_text(red, winSurface)
+					pygame.display.update()
+					motor.motor_loop(800,1)									# motor.motor_loop(size of the step, seconds to run the motor)
+                if event.key == K_ESCAPE or event.key == K_q:				# ESC to quit program
+                    motor.reset_motor()
+                    pygame.event.post(pygame.event.Event(QUIT))
+             
+        pygame.display.update()
+        msSince = fpsClock.tick(30)
+
+# calls the 'main' function when this script is executed
+if __name__ == '__main__': main()

ps pump equipment list and notes.txt

@@ -47,17 +47,30 @@ Connect your DC power adapter to the motor shield Vs / Gnd pins, and connect the
 					 |
 					Gnd
 
-The physical assembly was done using odd metal pieces I had laying around. I'm not particularly proud of it, but it works fine (it doesn't really need a physical assembly to be functional).
-	
-
+The physical assembly was done using odd metal pieces I had laying around. I'm not particularly proud of it, but it works fine (it doesn't really need a physical assembly to be functional). See pictures for reference.
 
 	
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 -----------------RASPBERRY PI/GERTBOARD VERSION-----------------
 ----------------------------------------------------------------
-A gertboard is overkill for this, but again, I already had it sitting around. :) I used a raspberry pi model B, with a pre-assembled gertboard to drive the motor. If you go the gertboard route, their manual is valuable: [  ]. 
-
-
+A gertboard is overkill for this, but again, I already had it sitting around. :) I used a raspberry pi model B, with a pre-assembled gertboard to drive the motor. If you go the gertboard route, their manual is valuable: [ http://www.element14.com/community/docs/DOC-51727/l/assembled-gertboard-user-manual-with-schematics ]. 
+
+0. Connect your Gertboard to your Raspberry Pi.
+1. Add one jumper wire between Gertboard pins (see pictures for reference): GP17 <-> MOTB
+2. Add another jumper wire between Gertboard pins: GP18 <-> MOTA
+3. Connect pump motor (+) to screw terminal MOTA and pump motor (-) to screw terminal MOTB.
+4. Connect the positive lead from your 12VDC adapter to screw terminal MOT+ and neutral to screw terminal ground.
+5a. Install wiringPi either w/apt-get from the command line:
+>> sudo apt-get update
+>> sudo apt-get install python-dev python-pip
+>>sudo pip install wiringpi
+5b. Or install wiringPi from the git repository:
+>> sudo apt-get install git-core
+>> git clone git://git.drogon.net/wiringPi
+>> cd wiringPi
+>> ./build
+6. Play with the other Gertboard examples (including motor ones) if you are so inclined:
+>> get http://raspi.tv/download/GB_Python.zip
 
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 --------------------------GENERAL NOTES-------------------------