#5 ESP8266 Drives a BUS

[@martins_kreicis]

Thank you very much for most interesting watch and explanation. I mostly use 12E for sensor readings and MQTT comunication. Apart from being slightly power hungry, they are excellent.

[@miikakurkela5606]

Thank you for your comment! Yes, the factory made ESP8166 modules are much too power hungry for battery powered systems. That’s why I like to use these ESP8266-DIY-modules and DIY-kits. By that way I can customize and minimize the power consumption of the flash memory, of the USB-to-TTL-converter and of the other peripheral components.

[@aerobyrdable]

Came here to see kids in the back of a school bus panicking as their driver takes his hands off the wheel.

[@miikakurkela5606]

Sorry! We are driving here an I2C serial communication bus.

[@MakunaRGBIC]

The Esp8266 Arduino GITHUB project already includes a custom Servo library that can drive IO pins to control these hobby servos directly.

[@miikakurkela5606]

Yes, if you want to use GPIO pins for controlling servos, this is fine. github.com/esp8266/Arduino/blob/master/doc/libraries.md#servo

[@xennelul]

I ran an ada fruit thing on 2AAs for 3 days straight before it died.

[@miikakurkela5606]

What do you think that was the reason that your device broke down? Our this video was mainly about the I2C bus. The PCA9685 chip was a good example for showing how to use the bus. But we must understand that the PCA9685 has been developed for controlling LEDs - not for motors. And as our main focus was on the I2C bus I didn’t apply in the video any heat sinks on the TB6612 chips! learn.adafruit.com/adafruit-motor-shield-v2-for-arduino/powering-motors#current-requirements The TB6612 chips are tiny DC motor drivers that are good for 1.2 Amp or less of current. They do handle peaks of 3A but that's just for a short amount of time, about 20 milliseconds. Adafruit likes these drivers as they with built in kick-back diodes internally so you don’t have to worry about the inductive kick damaging your project or driver. learn.adafruit.com/adafruit-tb6612-h-bridge-dc-stepper-motor-driver-breakout/overview

[@xennelul]

The batteries ran down (probably could squeeze out more by removing the LEDs. No big deal. Great video, great explanation!

[@TheMrFrontera]

Hi Miika, good video. I'm glad I stumbled upon it as I'm facing an issue using the PCA9685 chip to control the TB6612fng motor driver. This is for my senior design class so I have already prototyped using the breakout boards. But I have no made a custom PCB. On the custom PCB I have the STBY pin of the motor driver connected to pwm pin 15 on the PCA9685. The adafruit motor driver shield just keeps the standby enabled by shorting STBY to Vcc. I was thinking it would be nice to enable and disable the motors using the standby pin. But now, no matter what I do I can't get the standby pin to go high. Can you tell me how I can print the status (high or low) in the serial monitor? Since it's through i2c, I can't just use: Boolean status = digitalRead(15); Can I? And I am using the adafruit motor driver v2 library. So the way I am trying to get the pin high is changing the example code to include: AFMS.setPWM(15, 0, 4095);

[@TrasteIAm]

The coke bottle contraption is great, but would it not be better in combination with a matching koskenkorva contraption?

[@miikakurkela5606]

Tanks! I just wanted to use a bottle an liquid that is familiar to most of my viewers.

[@miikakurkela5606]

Somebody asked about the solenoid valve. See here docs.google.com/document/d/1709w3rWCzeXSalZyq--eyLgQ7-9PVSKb78e2WKyPFKQ/edit#heading=h.d72iloisfxeq

[@LearningToFly77]

Is this your normal Voice??? *lol*

[@miikakurkela5606]

My friends say it isn't. If you speak foreign languages, you know that it is quite difficult to pronounce sentences quickly and still clearly. My skills are growing up little by little. But this it is the best I can do right now.

[@leglessinoz]

I'm sure your attempts at speaking Finnish might sound a little odd to some people too. Miika does a good job and is very understandable.

[@rabbitez]

@@miikakurkela5606 Your accent is great! So much more pleasant than monotone American accents.

[@rickharms1]

I am fighting a losing battle, but here goes. A bus is a vehicle that carries people. A buss is an electrical circuit that distributes current.

[@miikakurkela5606]

www.i2c-bus.org

[@electron-1979]

Nice ;)