Motoron M2S18v18 Dual High-Power Motor Controller Shield for Arduino (No Connectors)

The Motoron M2S family of dual high-power motor controller shields makes it easy to independently control two bidirectional, brushed DC motors with an Arduino or compatible board, such as the A-Star 32U4 Prime. Unlike most of Pololu's motor drivers and motor driver shields, the Motoron does not require any PWM outputs or timers on your Arduino. Instead, the Arduino communicates with the Motoron using I²C, so only two I/O lines are needed. Four types are available so you can pick the one with the appropriate operating voltage range and output current capabilities for your project:

	Motoron M2S18v20 Dual High-Power Motor Controller Shield for Arduino	Motoron M2S18v18 Dual High-Power Motor Controller Shield for Arduino	Motoron M2S24v16 Dual High-Power Motor Controller Shield for Arduino	Motoron M2S24v14 Dual High-Power Motor Controller Shield for Arduino
Absolute max input voltage:	30 V		40 V
Max nominal battery voltage:	18 V		28 V
Max continuous current per channel:	20 A	18 A	16 A	14 A
Available versions:	assembled kit board only	assembled kit board only	assembled kit board only	assembled kit board only

Each of the four types above is available in three versions to provide different options for the through-hole connectors: they can be purchased as an assembled product with stackable headers and terminal blocks soldered in, as a kit with connectors included but not soldered in, or as a standalone board without connectors.

For a lower-power, lower-cost alternative Arduino shield, please consider the Motoron M3S256 Triple Motor Controller Shield for Arduino.

Details for item #5038

Motoron M2S18v18 Dual High-Power Motor Controller Shield for Arduino, top view.

The M2S18v18 shield operates from 6.5 V to 30 V (absolute maximum, not intended for use with 24 V batteries) and can deliver continuous output currents up to 18 A per motor. The M2S18v18 can be distinguished from other types of M2S shields by its smaller discrete MOSFETs and the number 150 on top of the tall silver electrolytic capacitors.

This version is just the assembled PCB module as shown above, with no connectors included. It is also available with connectors soldered or as a kit with connectors included but not soldered in.

Motoron M2S Dual High-Power Motor Controller Shield pinout.

Features and specifications

• Two motor control channels allow for independent control of up to two bidirectional brushed DC motors
• Reverse-voltage protection on motor power supply
• Logic voltage range: 3.0 V to 5.5 V
• Control interface: I²C
• I²C clock speed: up to 400 kHz
• Optional cyclic redundancy checking (CRC)
• Configurable motion parameters:
  • Max acceleration/deceleration forward/reverse
  • Starting speed forward/reverse
  • Direction change delay forward/reverse
• PWM frequency: eight options available from 1 kHz to 80 kHz
• Current sensing
• Configurable hardware current limiting
• Command timeout feature stops motors if the Arduino stops functioning
• Configurable automatic error response
• Motor power supply (VIN) voltage measurement
• Optional pins make it easy to power the Arduino from reverse-protected motor power, either directly or through an external regulator (not included)
• Two status LEDs
• Motor direction indicator LEDs
• Motoron Arduino library simplifies getting started using the Motoron with an Arduino or compatible controller
• Comprehensive user’s guide

Real-world power dissipation consideration

The MOSFETs can handle large current spikes for short durations (e.g. 100 A for a few milliseconds), and the driver’s current chopping will keep the average current under the set limit. The peak ratings are for quick transients (e.g. when a motor is first turned on), and the continuous rating is dependent on various conditions, such as the ambient temperature. PWMing the motor will introduce additional heating proportional to the frequency. The actual current you can deliver will depend on how well you can keep the motor driver cool. The driver’s printed circuit board is designed to draw heat out of the MOSFETs, but performance can be improved by adding a heat sink or air flow. For high-current installations, the motor and power supply wires should also be soldered directly instead of going through the 5mm blue terminal blocks, which are rated for up to 16 A.

Warning: This motor driver has no over-temperature shut-off. An over-temperature or over-current condition can cause permanent damage to the motor driver. You might consider using either the shield’s current sense or an external current sensor to monitor your current draw.

This product can get hot enough to burn under normal operating conditions. Take care when handling this product and other components connected to it.

The Motoron family

The table below lists the members of the Motoron family and shows the key differences among them. Each type is available in three versions to provide different options for the through-hole connectors: they can be purchased as an assembled product with stackable headers and terminal blocks soldered in, as a kit with connectors included but not soldered in, or as a standalone board without connectors.

Motoron Motor Controllers
	M3S256 M3H256	M2S24v14 M2H24v14	M2S24v16 M2H24v16	M2S18v18 M2H18v18	M2S18v20 M2H18v20
Motor channels:	triple (3)	dual (2)
Max input voltage:	48 V	40 V1		30 V1
Max nominal battery voltage:	36 V	28 V		18 V
Max continuous current per channel:	2 A	14 A	16 A	18 A	20 A
Available versions for Arduino:	M3S256 assembled kit board only	M2S24v14 assembled kit board only	M2S24v16 assembled kit board only	M2S18v18 assembled kit board only	M2S18v20 assembled kit board only
Available versions for Raspberry Pi:	M3H256 assembled kit board only	M2H24v14 assembled kit board only	M2H24v16 assembled kit board only	M2H18v18 assembled kit board only	M2H18v20 assembled kit board only
1 Absolute maximum.

Dimensions

General specifications

Identifying markings

Notes:

1

Absolute maximum; higher voltages can permanently destroy the motor drivers. Recommended maximum is approximately 24 V, which leaves a safety margin for ripple voltage on the supply line. Not recommended for use with 24V batteries.

2

Typical results at room temperature with both channels running at 90% duty cycle.

Documentation and other information

• 

  Pololu Motoron Motor Controller User’s Guide (Printable PDF)

  User’s manual for the Pololu Motoron Motor Controllers.

File downloads

• Dimension diagram of the Motoron M2S Dual High-Power Motor Controller Shield for Arduino (545k pdf)

• 3D models (STEP) of the Motoron M2S Dual High-Power Motor Controllers for Arduino (6MB zip)

  This file contains 3D models (in the step file format) of the Motoron M2S Dual High-Power Motor Controllers for Arduino.

• Drill guide for the M2S Motoron Dual High-Power Motor Controllers for Arduino (48k dxf)

  This DXF drawing shows the locations of all of the board’s holes.

Recommended links

• Motoron Motor Controller library for Arduino