Global Robotics
GMR (General Mobile Robot controller) is a discontinued DFRobot carrier and interface board designed for home-robot platforms such as HCR. It requires two separate Nano-class controller boards and one Arduino Mega or Mega ADK, distributing motor, sensor and main-control tasks between them. It provides sensor, wireless, storage and power interfaces. Manufacturer store and wiki sources publish differing input-voltage ranges; all claims are qualified in Specifications pending clarification. Cover image: Official DFR0271 gallery photograph of GMR V1.3 hardware; earlier wiki voltage claims are not confirmed for the pictured revision.
Source-backed claims. Configuration, workload and evidence type matter when comparing products.
10 A
Manufacturer specification
Configuration: GMR DFR0271; Manufacturer claim for the named GMR controller; host MCU boards are required separately.
Maximum Current output: 10A (@5V ports)
3 A
Manufacturer specification
Configuration: GMR DFR0271; Manufacturer claim for the named GMR controller; host MCU boards are required separately.
Maximum Current output: 3A (@Adjustable voltage terminal)
8 pins
Manufacturer specification
Configuration: GMR DFR0271; Manufacturer claim for the named GMR controller; host MCU boards are required separately.
Analog Input Pins 8
158 × 130 mm
Manufacturer specification
Configuration: GMR DFR0271; Manufacturer claim for the named GMR controller; host MCU boards are required separately.
Dimensions: 158 * 130 mm (L * W)
8 pins
Manufacturer specification
Configuration: GMR DFR0271; Manufacturer claim for the named GMR controller; host MCU boards are required separately.
Digital I/O Pins 8
Two Arduino Nano/Dream Nano and one Arduino Mega/Mega ADK
Manufacturer specification
Configuration: GMR DFR0271; Manufacturer claim for the named GMR controller; host MCU boards are required separately.
In this integrated version of GMR, you will need three microncontrollers (MCUs): two Arduino Nano / Dream Nano and one Arduino Mega /Arduino Mega ADK
3 interfaces
Manufacturer specification
Configuration: GMR DFR0271; Manufacturer claim for the named GMR controller; host MCU boards are required separately.
The GMR has intergrated 8 I/O ports, 8 analog ports and 3 I2C interfaces as input and output for Mega ADK.
9–24 V
Manufacturer specification
Configuration: GMR current store; Published manufacturer sources disagree on input voltage: store recommends 14–20 V and limits 9–24 V; wiki table recommends 12–23 V and limits 9–26 V; wiki power-supply paragraph recommends 7–20 V. Revision/connection applicability unresolved; do not use these as interchangeable validated limits.
Input Voltage (limits) 9-24 V
9–26 V
Manufacturer specification
Configuration: GMR wiki table; Published manufacturer sources disagree on input voltage: store recommends 14–20 V and limits 9–24 V; wiki table recommends 12–23 V and limits 9–26 V; wiki power-supply paragraph recommends 7–20 V. Revision/connection applicability unresolved; do not use these as interchangeable validated limits.
Input Voltage (limits) 9-26 V
5 and 3.3 V
Manufacturer specification
Configuration: GMR DFR0271; Manufacturer claim for the named GMR controller; host MCU boards are required separately.
Operating Voltage (logic level) 5 V & 3.3V
2 sockets
Manufacturer specification
Configuration: GMR DFR0271; Manufacturer claim for the named GMR controller; host MCU boards are required separately.
There are 2 Nano slots on the GMR.
14–20 V
Manufacturer specification
Configuration: GMR current store; Published manufacturer sources disagree on input voltage: store recommends 14–20 V and limits 9–24 V; wiki table recommends 12–23 V and limits 9–26 V; wiki power-supply paragraph recommends 7–20 V. Revision/connection applicability unresolved; do not use these as interchangeable validated limits.
Input Voltage (recommended) 14-20 V
7–20 V
Manufacturer specification
Configuration: GMR wiki power-supply paragraph; Published manufacturer sources disagree on input voltage: store recommends 14–20 V and limits 9–24 V; wiki table recommends 12–23 V and limits 9–26 V; wiki power-supply paragraph recommends 7–20 V. Revision/connection applicability unresolved; do not use these as interchangeable validated limits.
Input Voltage (recommended) 7-20 V
12–23 V
Manufacturer specification
Configuration: GMR wiki table; Published manufacturer sources disagree on input voltage: store recommends 14–20 V and limits 9–24 V; wiki table recommends 12–23 V and limits 9–26 V; wiki power-supply paragraph recommends 7–20 V. Revision/connection applicability unresolved; do not use these as interchangeable validated limits.
Input Voltage (recommended) 12-23 V
2 groups
Manufacturer specification
Configuration: GMR DFR0271; Manufacturer claim for the named GMR controller; host MCU boards are required separately.
3 groups of I2C pins can communicated with other controllers and 2 groups of RS485 belongs to another nano controller
microSD slot for Mega ADK
Manufacturer specification
Configuration: GMR DFR0271; Manufacturer claim for the named GMR controller; host MCU boards are required separately.
there is also a micro sd card slot for Mega ADK.
2 slots
Manufacturer specification
Configuration: GMR DFR0271; Manufacturer claim for the named GMR controller; host MCU boards are required separately.
There are two extra wireless communication plots that can be plugged with Xbee, Bluetooth and other communication modules.
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