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 You need to connect:

Shield D12 - Iotiny D0  Shield D 3  - Iotiny D1 Shield D13 - Iotiny D2 Shield D11 - Iotiny D3

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: and the PWM 0% to stop moving.

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 truth tables are not the same.

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: and is correct they use the NAND as NOT 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.

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They used the wrong symbol for the 4077D ic.

So if there is XOR maybe XAND must exists too: https://deepai.org/machine-learning-glossary-and-terms/xand

logic table: so it's a XNOR ...  So XOR is true when the inputs are different, a XAND (XNOR) is an "equivalence gate".

If we look careful there is an "e" inside of symbol and the meaning must be "exclusive" or "equivalence"...

no XAND boolean operator, it's an alias for XNOR.

@Jeremie: Does XAND makes sense when XNOR is the real operator  ?

@PTP

Thank you so much! That's really very helpful! You rock!