Hey, you can upload the Firmware to connect ARC directly to an Arduino...I guess thats the easiest option!

Hi,  good luck EzAng

@Ezang:

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I use ARC To drive and control DC motors I with a IoTiny with battery - with a L298N Motor Drive Controller Board Module Dual H Bridge DC Stepper Module for Arduino

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Is it possible to connect a motor shield like an Arduino A000079 Motor Shield to the iotiny

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Is it possible to connect a motor shield like an Arduino A000079 Motor Shield to the iotiny

A000079 Motor Shield documentation: https://store.arduino.cc/usa/arduino-motor-shield-rev3

Plus you will need to connect: Shield GND - Iotiny Black Pin (GND) The shield requires 5V to operate the circuits logic (not the motors), and sources from the Arduino 5V shield.

Out of the box the Iotiny has a stable 3.3v :

looking to the shield schematic: https://www.arduino.cc/en/uploads/Main/arduino_MotorShield_Rev3-schematic.pdf

uses L298N: https://www.sparkfun.com/datasheets/Robotics/L298_H_Bridge.pdf

The L298N accepts 3.3 v, but the shield is built to source 5V from the arduino board.

you have three options:

1. If you are powering the Iotiny from a stable (not batteries) 5v source you can connect the shield 5v to the iotitny (Vin).
2. You can try to connect the Iotiny 3.3 v to the Shield 5v and see if it works with a lower voltage.
3. You need a 5v DC/DC something like this: https://www.pololu.com/product/2851 using a DC/DC you can convert the Iotiny Vin > 6v to stable 5V and feed the shield.

This is only the wiring part, to make it work you will need to use custom Movement panel.

PTP - so does this hbridge work by having the direction true (forward) or (false) reverse? And to stop, simply stop the PWM?

yes it similar to this one too: https://www.dfrobot.com/product-656.html https://image.dfrobot.com/image/data/DFR0004/RoMeo%20V1.1%20sch.pdf

basically they use a single pin (dir) and nand circuit to generate two different signals with opposite values to control the in1 / in2:

The brake pins are used to send HI/HI or LO/LO to the IN1/IN2 that forces the H-Bridge to block the coil movement, so is an active/energized brake.

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basically they use a single pin (dir) and nand circuit

1. XNOR for an OR gate that inverts the inputs before OR'ing.
2. NAND gate: an AND gate with an inverted output.

*** Wrong check the next post ***

The previous post is incorrect, I was in a middle of something, to clarify:

the truth tables:

The arduino motor shield uses a XNOR (4077D): https://www.ti.com/lit/ds/symlink/cd4077b.pdf but in the schematic is displayed as NAND (not correct):

the dfrobot uses a NAND gate:

When i did the the post i look the nand symbol and following theirr implementation logic (XNOR) i assumed a NAND and XNOR produce the same output.

They used the wrong symbol for the 4077D ic.