Project:Line-following Robot: Difference between revisions
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I want to now move the circuit off my Arduino Uno with breadboard and onto a Xino with a "micro-shield". What's a micro-shield? It's a ghetto Arduino shield that uses just a few of the pins and can be knocked together cheaply with a few scraps of stripboard and pins. | I want to now move the circuit off my Arduino Uno with breadboard and onto a Xino with a "micro-shield". What's a micro-shield? It's a ghetto Arduino shield that uses just a few of the pins and can be knocked together cheaply with a few scraps of stripboard and pins. | ||
[[File: | [[File:Line-follow-micro-shield-001.png|none|400px|A micro-shield base]] | ||
I found this tiny bit of spripboard that was 12x4 holes but nicely separated down the middle... | I found this tiny bit of spripboard that was 12x4 holes but nicely separated down the middle... | ||
[[ | [[File:Line-follow-micro-shield-002.png|none|A micro-shield base]] | ||
I have loads of male header pins (we have boxes of them at Hackspace and I also get them from work) and here I'm using 7 pins that fit in digital pins 8, 9, 10, 11, 12, 13, and the ground pin. That gives me access to 3 digital pins with PWM and 3 without | I have loads of male header pins (we have boxes of them at Hackspace and I also get them from work) and here I'm using 7 pins that fit in digital pins 8, 9, 10, 11, 12, 13, and the ground pin. That gives me access to 3 digital pins with PWM and 3 without. | ||
The line-follower robot requires two PWM pins to drive the motors via a mosfet... | The line-follower robot requires two PWM pins to drive the motors via a mosfet. Here's a little circuit diagram I jotted down to help me with wiring... | ||
[[File:Line-follow-micro-shield-003.png|none|A micro-shield base]] | |||
I mounted the two mosfets with drain pins to a common ground linked to the GND pin... | I mounted the two mosfets with drain pins to a common ground linked to the GND pin... | ||
[[File:Line-follow-micro-shield-005.png|none|A micro-shield base]] | |||
I don't want to solder my motor wires on as I want to swap them between projects so I have two header pins per motor connection, slightly bent outwards, one pin goes to source on the mosfet and one pin goes to +5v... | I don't want to solder my motor wires on as I want to swap them between projects so I have two header pins per motor connection, slightly bent outwards, one pin goes to source on the mosfet and one pin goes to +5v... | ||
I'm using jumpers as little F-F connectors (a little trick I developed to save on expensive female headers)... | [[File:Line-follow-micro-shield-006.png|none|A micro-shield base]] | ||
I'm using jumpers as little F-F connectors (a little trick I developed to save on expensive female headers - I have hundreds of jumpers knocking around)... | |||
[[File:Line-follow-micro-shield-007.png|none|A micro-shield base]] | |||
The mosfets need gate connections (middle pin) to the PWM pins to switch on the motors... | The mosfets need gate connections (middle pin) to the PWM pins to switch on the motors... | ||
We also have a little jumper wire to go to the 5v pin on the other side of the Arduino... | We also have a little jumper wire to go to the 5v pin on the other side of the Arduino... | ||
Revision as of 12:06, 26 June 2012
As part of the Arduino 102 (or is it 201?) we built line-following robots...
((insert video here!))
Photos at https://plus.google.com/photos/101627167067307203883/albums/5758095721560984897 ((the upload process takes too long from the wiki so I'll sort it out later))
I want to now move the circuit off my Arduino Uno with breadboard and onto a Xino with a "micro-shield". What's a micro-shield? It's a ghetto Arduino shield that uses just a few of the pins and can be knocked together cheaply with a few scraps of stripboard and pins.
I found this tiny bit of spripboard that was 12x4 holes but nicely separated down the middle...
I have loads of male header pins (we have boxes of them at Hackspace and I also get them from work) and here I'm using 7 pins that fit in digital pins 8, 9, 10, 11, 12, 13, and the ground pin. That gives me access to 3 digital pins with PWM and 3 without.
The line-follower robot requires two PWM pins to drive the motors via a mosfet. Here's a little circuit diagram I jotted down to help me with wiring...
I mounted the two mosfets with drain pins to a common ground linked to the GND pin...
I don't want to solder my motor wires on as I want to swap them between projects so I have two header pins per motor connection, slightly bent outwards, one pin goes to source on the mosfet and one pin goes to +5v...
I'm using jumpers as little F-F connectors (a little trick I developed to save on expensive female headers - I have hundreds of jumpers knocking around)...
The mosfets need gate connections (middle pin) to the PWM pins to switch on the motors...
We also have a little jumper wire to go to the 5v pin on the other side of the Arduino...