Some time ago I was doing work for a company that was tasked with automating the engagement of a piece of survey equipment from an F-150 truck. The covered bed needed to 1open from the top, 2the turret needed to left, and 3finally the equipment needed to turn into position. All at the flip of a switch. Then, when the switch was flipped back, the operations needed to go in reverse.
The company I was working for ended up using a micro-controller and proximity sensors for the limit switches. However I believe this relay-centric design is still a great thought experiment and is worth taking a closer look at. The link to a video of the "laser truck" the circuit was designed for is located here.
There were only a few rules to follow:
- No motor or actuator current may run through any of the control or limit switches
- All operations must be controlled by the user with just one switch
- When the sensor array (the package) is in the truck and at rest, all equipment must be off (no relays my be active)
MoDaC 2.0 - The "Transformer"
McAlpine Devices Relay Logic Machine
BRAINLUBEONLINE (for more his projects)
- Relay Logic Machine - Mechanical relay logic using a microcontroller
- Mechanical relay logic that was snubbed for a microcontroller - Hack a Day
- Relay Logic
- Just in case you didn’t know how awesome laser cutters really are - Hack a Day
- McAlpine Devices Relay Logic Machine - YouTube
- modac - YouTube
- MoDaC Technology Tour - YouTube
- MoDaC 2.0 - The "Transformer" - YouTube
- The Amazing Brainlubeonline.com