Pololu TReX Jr Manual do Utilizador

Pololu TReX Jr User's Guide1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

for the mode selected by the “channel input source” parameter (this parameter’s default value is RCmode).▪ Red and green LEDs blink in unison around o

otherwise it continues to the next phase, which is learning the values of the extremes. Once this lastlearning phase is complete, the status LEDs will

6. Place the mode jumper to select for either RC or analog (whichever type of controller you’re trying tocalibrate for).7. Restore power to your TReX

4. RC/Analog in DetailThis section provides a detailed overview of the RC and analog modes of operation. It explains how the TReX Jrprocesses its chan

The TReX Jr measures the width of RC servo pulses with 12-bit resolution and an accuracy of 1 us. The raw channelvalue is provided as a 12-bit number

1. All required channels must have a valid signal. This only applies when the TReX Jr is in RC mode sinceit’s not possible to have an invalid analog s

5. The Serial InterfaceYou can use the serial interface for four general purposes: querying the TReX Jr for information (any mode), settingits configu

significant bits cleared (i.e. range from 0 – 127). This means that each data byte can only transmit seven bits ofinformation.One significant improvem

5.c. Serial Command List and DocumentationThe TReX Jr command documentation [http://www.pololu.com/file/download/TReXJr_Commands_v1.0.pdf?file_id=0J12

1 0 0 0 1 0 0 1 ) 1 0 0 0 0 1 1 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0 0XOR 1 0 0 0 1 0 0 1 | | | | | | | | | | | | | | |--------------- | | | | | | | | | | |

1. OverviewThe TReX Jr Dual-Motor Controller [http://www.pololu.com/catalog/product/767] is a versatile DC motor controllerdesigned to seamlessly blen

// generate a table value for all 256 possible byte valuesfor (i = 0; i < 256; i++){CRCTable[i] = (i & 0x80) ? i ^ CRCPoly : i;for (j = 1; j &l

6. Updating the TReX Jr's FirmwareCurrent Firmware Versions• Our most recently released firmware update for the TReX Jr motor controller istrexjr

Option 1: using the TReX Configurator programRun the TReX Configurator program [http://www.pololu.com/file/download/TReXConfiguratorInstaller_090923.z

your current firmware and you will then see a progress bar showing you the status of the upload. If no errors occur,you will see a success message whe

2. Contacting PololuYou can check the TReX Jr motor controller page [http://www.pololu.com/catalog/product/767] for additionalinformation. We would be

3. Getting StartedTReX Jr input/output connection pointsGetting started with your TReX Jr can be as simple as connecting power, your motors, and your

Note: The TReX Jr uses a linear voltage regulator to obtain its logic voltage (5-V Vcc). If you supply aVIN of 24 V, your Vcc line will be limited to

TReX Jr motor connections (separate battery for the auxiliary motor)It is possible to power the auxiliary motor with a second, separate 0 – 24 V batte

Warning: This middle Vcc column is tied to the output of a linear voltage regulator, so its current outputis limited by thermal dissipation. The regul

TReX Jr before changing jumpers (other than the mix jumper, which can be changed at an time). This is not strictlynecessary, but it is the safest prac

to upgrade its firmware. When placed across the SO and G pins, this jumper puts the TReX Jr into learning/firmware-upgrade mode via the “secret handsh