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Gertbot Advanced Rev 0.2 8-Sept.-2014

Gertbot Advanced

Rev-0.2, 8-Sept.- 2014

The Gertbot is a motor controller board for the Raspberry-Pi. For details how to operate it read the

Gertbot manual and/or the Gertbot GUI. This manual describes how to unlock some of the more

challenging features of the board.

Contents

Cascade. .................................................................................................................................................. 2

More current for DC motors. .................................................................................................................. 3

More current for Stepper motors. ............................................................................................................ 5

Going to DC 10 Amp. ............................................................................................................................. 5

Going to Stepper 10 Amp. ...................................................................................................................... 6

Uploading new software. ........................................................................................................................ 6

Board Erase. ............................................................................................................................................ 6

Gertbot Advanced Rev 0.2 8-Sept.-2014

Cascade.

To use two or more boards you need to make a cascade cable. That is a ﬂat cable with up to four 8-pin

female headers. This is such a cable:

The length of the cable depends on how far apart you want to mount the boards. If you stack them

using 15mm stand-oﬀs you need 120 mm cable. You also need an 8-pin IDC press connector per

board. I put a video on YouTube how to make a press connector a while ago:

http://www.youtube.com/watch?v=sMiRoXY_oZg.

The following picture shows an example how the cable can be connected to four boards.

Note that the jumpers on the picture above . You must give each board a unique ID. are wrong

The following diagram shows the with the jumpers: ID

ID=0 ID=1 ID=2 ID=3

Gertbot Advanced Rev 0.2 8-Sept.-2014

More current for DC motors.

One H-bridge can pass 2.5A. As we have four of them it is possible to combine bridges to allow more

then 2.5A. Here is the part of the schematics which deals with the signals we are going to mess about

with:

Beware the A1, A2, .. D2 here are NOT the out s of the bridge put

on the terminals. These are internal signals on the board.

H0, L0, H1, L1, H2, L2, H3, L3 are signals from the controller. They are going to the H-bridges to

control the outputs. Coming from the factory the following connections are present:

H0 A1 A2 H1→ L0→ →B1 B2 L1→

H2 H3 D1 D2→C1 C2 L2→ → L3→

To make two bridges work in parallel for a we have to give them the same control signals. DC motor

Thus to connect A and B in parallel we need the following connections:

H0 A1 A2→ L0→

H0→B1 B2 L0→

The board has a special layout to make this easy. In this case the board layout looks just like the

schematic: Un-solder R14, rotate it 90 degrees and solder it down again:

Produktspecifikationer

Varumärke:	Raspberry Pi
Kategori:	Inte kategoriserad
Modell:	8486806
Färg på produkten:	Black, Blue
Vikt:	500 g
Bredd:	290 mm
Djup:	83 mm
Höjd:	123 mm
Förpackningens vikt:	1000 g
Laddningstid:	5 uur
Batteri/Batterispänning:	3.6 V
Batteri-liv:	60 min
Batterij capaciteit:	1.3 Ah
Batteriteknik:	Lithium-Ion (Li-Ion)
Bladbredd:	70 mm