Scratch GPIO Robot

[Workinmanva]

Hello

 

I'm building a robot using scratchgpio7. I'm trying to install the ultra sonic sensor to prevent it from hitting the wall when my son gets to crazy with the controls.

In the sense blocks there is no sonar23 option only pin 23. I tried using If pin23 sense = 0 To stop the motors. This did not seem to work.

 

The line of code looked like this:

 

Pin11-100

Pin13-100

Wait 1 sec

 

If

Pin23 Sensor value =5 (also tired =0)

Wait .18 sec

Pin11-0

Pin13-0

 

Pin11-0

Pin13-0

Stop script

 

I wired it up as per Simons wiring diagram on his wed site using a single pin. I hope this makes some sense.

[SimpleSi]

Hi

looking at what you posted, I'd say your using your own motor controller board?

 

if so, you need to create two variables called power11 and power13 and then set those values between 0 to 100 to vary the speed of the motors.

 

If you've wired up you ultrasonic with the 3 resistors like Ultrasonic Sensor | Cymplecy (Simplesi)

and connected to pin23 then jsut use the

broadcast sonar23

wait 1

 

and then read the sonar23 sensor value

(just tick the little box next to it to see its value displayed on the screen

 

http://snag.gy/12jT3.jpg

 

regards

Simon

[Workinmanva]

Robot 2

 

Hello everyone

Thanks for the help Simon. I finally got the ultra sonic sensor working. The weird thing is the SENSOR23 code only shows up randomly in the sensor blocks.

I wanted to show off some pics and a list of the hardware I used to build my scratchGPIO robot. I'm running Scratch GPIO7 and also using Motion-mmal to operate the raspi cam. So far very thing works great.

 

Hardware:

 

Raspberry pi A+ (running scratch)

Raspberry pi A+ (Running Motion-mmal)

Drok H-Bridge

Turtle robot chasis

Custom double deck 1/8 plexi glass top

Vilros wifi adapter

Pi Hut wifi adapter

5volt power supply (Anker 2nd Gen Astro)

5volt power supply

Ultra sonic sensor (Sun Founder) HC-SR04

Mallofusa pan and tilt servo assembly MG995 servos

Bread board power strip

Bread board

7.5 volt motor/accessory power supply w/ 2300 ma rechargeables

Raspberry pi camera module

12" camera module ribon

Dual 10mm clear LED lights w/ custom machined mounting bracket

3mm station kit

Micl. Nylon spacers and hardware

Micl. Wires, jumper leads, and resistors

8 gig micro SD cards running NOOBS

 

Software:

 

ScratchGPIO7

Motion-mmal

Both Pi's running: VNC, and Static IP Addresses

 

Thanks for lookin

Sean

Edited June 26, 2015 by Workinmanva

[SimpleSi]

Wow - an impressive machine

 

Sonar23 will not show up as a sensor until you've done a broadcast sonar23.

 

Its a chicken/egg situation Scratch doesn't know about any ultrasonics until you use it

 

You might want to use broadcast ultra23 instead.

 

The difference is that once you've broadcast ultra23, then ScratchGPIO will automatically do a reading every second and silently update the sensor value (ultra23)

 

So if 1 sec intervals are short enough, it saves having to keep on pinging

 

Simon

Edited June 26, 2015 by SimpleSi