CEB Press/Manufacturing Instructions/Detroit Fab Lab Solenoid Driver v2

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Introduction

This is the official Generation 3 Electronics system for the CEB Press. This displaces the need for an Arduino breakout board in the controller design, reducing both cost and complexity of the controller significantly. This circuit has not yet been field tested extensively under CEB operating conditions. Full control simulation with manual analog signal changes have been a success. Developers are encouraged to build Generation 3 CEB Electronics. Generation 1 and 2 electronics are outdated. See blog post on CEB controller electronics generations. put sensor terminals on detroit board

Schematic (note: v_in connection missing)
small version 2x3. This was done in MS Paint - a modification of initial Detroit solenoid driver board. Note: instead of using Microsoft Paint try using PAINT.NET all of those operations are available there and it's OPENSOURCE. (note: v_in connection corrected)
image for pcb etching. This was generated by reversing black and white from the MS Paint drawing by using GIMP. (note: v_in connection corrected)
drawing with diodes


image to print for toner transfer [1]

Width - 3"
Height - 4.5"


sketchup model for milling [2]


General Processes/Circuit Etching

wiring diagram

CEBPressControlBoxWiringDiagramv3.png

Finished Board

Note: jumper not needed, already corrected in board image for pcb etching.

Controllerupgrade.jpg


size options

Error creating thumbnail: File with dimensions greater than 12.5 MP
fat version

http://search.digikey.com/us/en/products/PC5/PC5-ND/135977

a 3 x 4.5" board is $3.53

http://search.digikey.com/us/en/products/509/473-1002-ND/559705

a 6 x 6" is $6.38

Assistance

Upgrades

1

Field testing at Factor e Farm in 2011 has shown that twigs and rocks can jam the soil loading drawer if these are not crushed by the scissor action of the drawer. In the case of a jam, we uploaded the CEB testing code interface to move the drawer and get it unstuck - by computer control via USB cable. This is time consuming, so the next iteration should include manual bypass toggles on the controller board itself, so the user can move the drawer manually as needed. This applies to both the primary and secondary cylinder.

To do this, a simple toggle switch such as the reset switch should be placed between the 5V power and the digital output (d9 or d10) pin corresponding to the left (ejection) motion of the secondary cylinder. This is not necessary for the main cylinder, which has 20 tons of force. This is also not necessary for the right motion of the secondary cylinder, since such motion is already present upon power cycling of the controller.

Implementation

Do we need just a connection to be closed between 5V and the d9 or d10? An?y resistors in between?

how about a "garage door" button. if its running and you push it it will stop. push it again it goes in reverse. push it again it stops. push it again it continues along again. if we had a button that connected one of the digital channels to the ground would that be sufficient to trigger the software? we could put a button on the board or have a terminal wired to an external box button. --Dorkmo 04:15, 3 December 2011 (CET)

Resolved

The initialization sequence which moves the secondary cylinder to the left in addition to the right addresses the issue of jams, without the solenoid manual button on the controller.

2

For full manual testing of hydraulics without using a control computer, 5 of these manual toggles should be applied, one for each hydraulic channel.


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