Mar
25
Mon

Shenzhen Mini Maker Faire

Renbotics will be at the Shenzhen Mini Maker Faire on the 6th of April.

Feb
24
Sun

NEW TinyQED and Tindie

The TinyQED is an ATTiny45 based widget that makes quadrature encoder counts available via I2C. The counts can easily be read from an Arduino or similar using the Wiring library.

After many years of procrastination, 2008, to 2010 to today, the TinyQED is finally available.

Since I do not do this full time, the time required to create the tools, documentation, and facilitate the knowledge transfer with third party manufacturers is simply too much. For the quantities that I sell I can manufacture the kits myself and ensure quality is to the standard I want. Thus I have decided to start selling on Tindie, with the TinyQED and Prototype Side Shield kits being trial products. Checkout the products on Tindie, more to come soon.

I sell on Tindie

Feb
17
Sun

FAQ beginnings

Customers regularly ask similar questions. To make it easy to get answers below are the initial entries for the new FAQ.

Testing was done using an Arduino Uno R3, Servo Shield 2, Hobby Wing 8A UBEC, Turnigy 4500mAh 2C Li-Po, 8 Hextronik HXT 900 servos, 6 Hextronik HX5010 servos and 2 RobotBase RB-421 servos. Measurements were preformed with an Agilent U1272A.

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Dec
21
Fri

Find the address of your Servo Shield 2

Cant find the address of your Servo Shield 2? Use the sketch below adopted from the i2c_scanner on the Arduino Playground.

Remember the PCA9685 used by the Servo Shield 2 has two reserved addresses, 80 and 112.

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Dec
9
Sun

Fritzing Component

Fritzing is an excellent tool for prototyping, documentation, etc. To make all these activities easier for the Servo Shield we created a Fritzing component. Over the next several weeks all blog entries will be updated to use the new Fritzing graphics and Servo Shield Rev 2. Download the Fritzing component from GitHub.

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Nov
26
Mon

NEW Servo Shield 2

The Servo Shield 2 based on the PCA9685, is now available. The new shield uses only two pins via I2C to provide 16 free-running servo outputs. Up to 62 shields can be used to control 992 servos from a single Arduino. The new shield uses none of the hosts timers, less RAM, and makes it easier to connect 16 servos than before. Now available from SeeedStudio and Sedonia Technologies.

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Jan
9
Sun

GIT

The latest versions of all Libraries, Hardware designs and Documents are now hosted at GitHub. https://github.com/renbotics

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Jun
13
Sun

Robotic Arm Inverse Kinematics with Arduino and Servo Shield

Circuits@Home replaced the control system of a Lynxmotion AL5D robotic arm with an Arduino and a Servo Shield. More information at Circuits@Home

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May
13
Thu

Updated Servo Shield Library

The Servo Shield library has been updated to fix a major bug relating to pin output mapping. Download revision 1.5

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May
10
Mon

Back in stock

The Renbotics Servo Shield is back in stock at SeeedStudio and now comes in red.

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Oct
18
Sun

Arduino Servo Shield Sequencer with 256K External EEPROM

The Servo Shield Sequencer works great for short sequences, up to 255 steps, but what if you need more than 255 steps?

tronixstuff has a very good tutorial showing just how easy it is to add external I2C EEPRom to the Arduino. Within 10 minutes you can go from having only 1Kbyte of EEPRom on the Duemilanove to having 256Kbytes using a 24LC256.

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Oct
4
Sun

Arduino Servo Shield Sequencer Web Interface

While the Renbotics Servo Sequencer serial protocol works for displaying, adding and playing sequences it is not the most intuitive interface when showing off your creations.

To make it more user friendly we created the Renbotics Servo Sequencer Web Interface.

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Sept
20
Sun

Renbotics Servo Shield Sequencer

While thinking of exciting things to do with the new Renbotics Servo Shield an easy to use sequencer came to mind. Searching around did not deliver anything suitable, thus we created the Renbotics Servo Sequencer serial protocol.

The first challenge was; how to store the sequence? We decided to use the Arduino's internal EEPROM to store the sequences in a simple command structure:

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