Arduino motor shield with iotiny

Question

Is it possible to connect a motor shield like an Arduino A000079 Motor Shield to the iotiny to control a pair of DC motors? If so, how would it be wired?

ptp · Accepted Answer

@Ezang: Quote: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 ArduinoPlease stop spamming ! Can you please explain how your answer helps answering the user question: Quote:Is it possible to connect a motor shield like an Arduino A000079 Motor Shield to the iotiny

Mickey666Maus · Answer

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

EzAng · Answer

Hi,  good luck EzAng

ptp · Answer

Quote:Is it possible to connect a motor shield like an Arduino A000079 Motor Shield to the iotinyYes it's possible, but has additional requirements and you will need to use the "Custom Movement Panel"  https://synthiam.com/Docs/Skills/Movement-Panels/Custom-Movement-Panel?id=16077 with some scripting. 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.

DJ Sures · Answer

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

ptp · Answer

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.

ptp · Answer

Quote:basically they use a single pin (dir) and nand circuitboth terms are correct: 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 ***

ptp · Answer

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.

ptp · Answer

Quote:They used the wrong symbol for the 4077D ic.I couldn't let it go... and they are not wrong. 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  ?

sampaano · Answer

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

sampaano

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