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RoHS

SD21 - 21 Servo Control Module

Devantech

The SD21 is a 21 channel servo controller module. It will drive up to 21 RC servo's and maintain a 20mS refresh rate, regardless of the number of servo's used or their positions (pulse widths). It will control both position and speed of the servo's. It's controlled by sending commands to the on-board PIC18F2220 over the I2C bus. There are 3 I2C connectors on the board, any one of which can be used to connect to your controller. Alternatively, many controllers such as the Picaxe, BS2p, Atom, BX-24 etc. can be fitted directly to the module, making this a great animatronics controller.

Connections


Power

There are two ways to power the SD21. The first is to used a 5v supply for the processor section and a separate 6v-7.2v supply for the servo's. This is the recommend method, and the 4-way terminal block allows for this option. The logic and servo grounds are internally connected on the PCB.
Not everyone wants to use two batteries, so we have allowed for the use of a single (typically 7.2v) battery to power the servo's and the module. To do this place a link on the two pin header below the terminal block. This routes servo power to a low drop 5v regulator which supplies the logic. The connections must be made to the servo terminals on the terminal block - NOT the logic ones.
The SD21 monitors the servo battery voltage, which is available for reading from an internal register.


Connection of Servos

The servo's are plugged directly onto the SD21, with the ground pin (black wire on a hitec servo) nearest the outside of the PCB.


Download

Konstruktion und 3D-Simulation eines mobilen Roboters mit hexapoder Gangart, gesteuert über Walknet-Laufregelung, Diplomarbeit, Markus Seemann und Jan Ryll, Fachhochschule Regensburg 2005 (German)


Links

Diplomarbeit, Markus Seemann und Jan Ryll, Fachhochschule Regensburg 2005 (German)


Manufacturer's data

Technical Specification - link to the manufacturer

Product information for: SD21 - 21 Servo Control Module

Publishing date (date of last technical specification): 2009-01-22
Shipping weight: 200 g
Manufacturer: Devantech
Brand: ROBOT ELECTRONICS
Article number: DEV-SD21
Manufacturer's part number: SD21

The article SD21 - 21 Servo Control Module is listed in the following categories:

Modules > Communication

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Order online now

EUR 30.98 EUR 26.03
Price incl. VAT Price excl. VAT
plus EUR 5.95 shipping costsplus EUR 5.00 shipping costs

Immediate delivery

Available for immediate delivery while stock lasts.

2 in stock
updated: 27.11.2019

Information on currency

EUR 30.98 = GBP 26.55 EUR 26.03 = GBP 22.31 (€1=GBP0.85715)
EUR 30.98 = USD 34.14 EUR 26.03 = USD 28.69 (€1=USD1.1020)
EUR 30.98 = CAD 45.43 EUR 26.03 = CAD 38.17 (€1=CAD1.4663)
EUR 30.98 = AUD 50.35 EUR 26.03 = AUD 42.30 (€1=AUD1.6251)

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About ROBOT ELECTRONICS

ROBOT ELECTRONICS is a brand by English manufacturer Devantech Ltd., based in Norfolk. Product range comprises sensors, in particular ultrasonic or compass, servocontrollers as well as small robot drive systems or relay modules with various interfaces. Sensors are produced in England and are of consistently high quality.

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