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by tlfong01
Thu Mar 14, 2019 12:40 pm
Forum: Automation, sensing and robotics
Topic: Choosing motors
Replies: 36
Views: 3153

Re: Choosing motors

4tronix Robots References Amazon 4tronix Picon Zero v1.3 Intelligent Robotics Controller Board for Raspberry Pi https://www.amazon.co.uk/4tronix-Intelligent-Robotics-Controller-Raspberry/dp/B01E8MXQWY robotics controller board for Raspberry Pi Fully supported with extensive Python library drive Ser...
by tlfong01
Thu Mar 14, 2019 7:20 am
Forum: Troubleshooting
Topic: Is it possible to wire hats to GPIO pins instead of attaching them through a header?
Replies: 7
Views: 351

Re: Is it possible to wire hats to GPIO pins instead of attaching them through a header?

I am working on a robotics project and I need to attach a Speaker phat and also a Picon zero to the same Pi Zero . I am aware that hats don’t use all of the gpio pins but they usually come with an header which covers all the gpios. I was wondering if it would be possible to attach individual wires ...
by tlfong01
Thu Mar 14, 2019 5:31 am
Forum: Automation, sensing and robotics
Topic: Choosing motors
Replies: 36
Views: 3153

Re: Choosing motors

4tronix Robots References Amazon 4tronix Picon Zero v1.3 Intelligent Robotics Controller Board for Raspberry Pi https://www.amazon.co.uk/4tronix-Intelligent-Robotics-Controller-Raspberry/dp/B01E8MXQWY robotics controller board for Raspberry Pi Fully supported with extensive Python library drive Ser...
by tlfong01
Thu Mar 14, 2019 4:50 am
Forum: Automation, sensing and robotics
Topic: Choosing motors
Replies: 36
Views: 3153

Re: Choosing motors

MPU6050 Datasheet R3.4 - InvenSense 2013 https://store.invensense.com/datasheets/invensense/MPU-6050_DataSheet_V3%204.pdf MPU-6000/MPU-6050 Register Map and Register Descriptions Document V4.2 - InvenSense 2013 https://www.invensense.com/wp-content/uploads/2015/02/MPU-6000-Register-Map1.pdf MPU6050...
by tlfong01
Thu Mar 14, 2019 4:30 am
Forum: Automation, sensing and robotics
Topic: Choosing motors
Replies: 36
Views: 3153

Re: Choosing motors

https://www.amazon.co.uk/gp/aw/d/B07HBN8M1B?psc=1&ref=ppx_pop_mob_b_pd_title These are the motors I am using for my robot project and they seem pretty good, I've tested them through a picon zero. 4tronix PiCon Zero https://4tronix.co.uk/blog/?p=1224 I visited 4tronicx and found their Pi2Go-Lite als...
by tlfong01
Wed Mar 13, 2019 2:57 pm
Forum: Automation, sensing and robotics
Topic: Choosing motors
Replies: 36
Views: 3153

Re: Choosing motors

https://www.amazon.co.uk/gp/aw/d/B07HBN8M1B?psc=1&ref=ppx_pop_mob_b_pd_title These are the motors I am using for my robot project and they seem pretty good, I've tested them through a picon zero. TT RS130 1/120 Motor with Hall Effect AB Encoder 1440 pulses per wheel revolution Picon Zero looks good...
by tlfong01
Wed Mar 13, 2019 12:18 pm
Forum: Automation, sensing and robotics
Topic: Choosing motors
Replies: 36
Views: 3153

Re: Choosing motors

Reading data MPU-6050 on Rpi Python - BitiFly 2013nov07 http://blog.bitify.co.uk/2013/11/reading-data-from-mpu-6050-on-raspberry.html MPU6050 References Now I am collecting more references for programming MPU6050. MPU6050 Datasheet R3.4 - InvenSense 2013 https://store.invensense.com/datasheets/inve...
by tlfong01
Tue Mar 12, 2019 3:07 pm
Forum: Automation, sensing and robotics
Topic: Choosing motors
Replies: 36
Views: 3153

Re: Choosing motors

Next is to write a python program to do more tests. Reading data from the MPU-6050 on the Raspberry Pi (using python) - BitiFly 2013nov07 http://blog.bitify.co.uk/2013/11/reading-data-from-mpu-6050-on-raspberry.html MPU6050 Block Diagram Newbie must do - look at the block diagram before writing any...
by tlfong01
Tue Mar 12, 2019 2:31 pm
Forum: Automation, sensing and robotics
Topic: Choosing motors
Replies: 36
Views: 3153

Re: Choosing motors

MPU6050 i2cdetect and i2cset test OK I followed BitiFly's tutorial and found i2ctools commands i2cdetect can detect MPU6050 at 0x68 and i2cset can read its register 0x75. Next is to write a python program to do more tests. Interfacing Raspberry Pi and MPU-6050 (using i2ctools commands i2cdetect and...
by tlfong01
Tue Mar 12, 2019 1:17 pm
Forum: Automation, sensing and robotics
Topic: Choosing motors
Replies: 36
Views: 3153

Re: Choosing motors

MPU6050 Newbie References I googled and found a blog site by BitiFly with python examples on how to use MPU6050. I think it is good for newbies. I also found a python library by Tijnadgamer but I do't find enough documentation for newbies. So I will first try the BitiFly's examples. Interfacing Ras...
by tlfong01
Tue Mar 12, 2019 9:05 am
Forum: Automation, sensing and robotics
Topic: Choosing motors
Replies: 36
Views: 3153

Re: Choosing motors

2. gyros had a motor and a big spinning wheel. 3. Accelerometers size of single serve baked beans cans. 4. An IMU as accurate as the 6050, ... MEMS MPU6050 My MPU6050 module measures 1.5cm x 2cm (update - the chip is only 4mm x 4mm x 0.9mm). So how big is your big spinning wheel? Did you take a sel...
by tlfong01
Tue Mar 12, 2019 7:35 am
Forum: Automation, sensing and robotics
Topic: Choosing motors
Replies: 36
Views: 3153

Re: Choosing motors

1. Pixart robot vacuum navigation, optical mouse sensor, help bot suck in straight lines 2. gyros had a motor and a big spinning wheel. 3. Accelerometers size of single serve baked beans cans. 4. An IMU as accurate as the 6050 was only on Nuclear submarines or later on cruise missiles? Nuclear subm...
by tlfong01
Mon Mar 11, 2019 2:58 pm
Forum: Automation, sensing and robotics
Topic: Choosing motors
Replies: 36
Views: 3153

Re: Choosing motors

TT RS130 Motor Toy Car tlfong01's Toy Car DIY PenZu Diary https://penzu.com/p/39061ac7 Toy 4WD Assembly and Testing Notes Plastic cheap things are very good for quick prototyping. I am using a old plastic box cover to hold the gear motors. Both the box and motors are very forgiving for poor, carele...
by tlfong01
Mon Mar 11, 2019 11:41 am
Forum: Beginners
Topic: RPI Zero W multiple sensors
Replies: 27
Views: 2455

Re: RPI Zero W multiple sensors

sensors weren't working in this period of time? you just put them there or you test them in these 4 weeks? Goldfinger 606 Ah, I just put them there to check out how rusty can they go. :mrgreen: In the mean time, I am evaluating the deluxe, high resolution, never get rusty gold finger 606. Goldfinge...
by tlfong01
Mon Mar 11, 2019 7:15 am
Forum: HATs and other add-ons
Topic: I2C I/O PORT EXPANDER QUESTION
Replies: 37
Views: 2683

Re: I2C I/O PORT EXPANDER QUESTION

the EL817C optoisolater current limiting resistance value of 1k is designed to be 5V TTL compatible. You can change it to 6k, so that it is < 1V on and > 2.5V off, in other words, now both Rpi 3V3 and TTL 5V compatible. Getting around Rpi 3V GPIO signal not high enough to switch off EL817C opto iso...
by tlfong01
Mon Mar 11, 2019 5:43 am
Forum: Beginners
Topic: RPI Zero W multiple sensors
Replies: 27
Views: 2455

Re: RPI Zero W multiple sensors

tlfong01 wrote:
Mon Mar 11, 2019 4:57 am
Moisture Sensor Corrusion Test Results
After 4 weeks, water dried out, sensors got a bit rusty.

Moisture Sensor Corrosion Test #2

Now I am testing again, this time in deep water which should not dry out so soon. :mrgreen:
...
by tlfong01
Mon Mar 11, 2019 4:57 am
Forum: Beginners
Topic: RPI Zero W multiple sensors
Replies: 27
Views: 2455

Re: RPI Zero W multiple sensors

tlfong01 wrote:
Thu Feb 14, 2019 5:17 am

Moisture Sensor Corrusion Test Results

After 4 weeks, water dried out, sensors got a bit rusty.
...
by tlfong01
Mon Mar 11, 2019 4:18 am
Forum: Automation, sensing and robotics
Topic: Choosing motors
Replies: 36
Views: 3153

Re: Choosing motors

TT motors are the best value for hobby bots, good to learn on. Replacement RS-130 size motors are low cost, even here only $1. TT RS130 Motors for Toy Cars Yes, 130 motors are very good for poor hobbyists. So I have started learning. :mrgreen: tlfong01's Toy Car DIY PenZu Diary https://penzu.com/p/...
by tlfong01
Sun Mar 10, 2019 12:28 pm
Forum: HATs and other add-ons
Topic: I2C I/O PORT EXPANDER QUESTION
Replies: 37
Views: 2683

Re: I2C I/O PORT EXPANDER QUESTION

tlfong01 wrote:
Sun Mar 10, 2019 1:53 am

Duplicated post by mistake. My apologies.
by tlfong01
Sun Mar 10, 2019 7:09 am
Forum: HATs and other add-ons
Topic: I2C I/O PORT EXPANDER QUESTION
Replies: 37
Views: 2683

Re: I2C I/O PORT EXPANDER QUESTION

(2) Rpi GPIO is only 3V logic. You might need to consider using logical level shifter to convert the signals to 5V. Rpi 3V GPIO Compatible Opto Isolator/Level Converter and Power MOSFET Switch Actually you don't need all things 5V TTL compatible. For example the EL817C optoisolater current limiting...
by tlfong01
Sun Mar 10, 2019 1:53 am
Forum: HATs and other add-ons
Topic: I2C I/O PORT EXPANDER QUESTION
Replies: 37
Views: 2683

Re: I2C I/O PORT EXPANDER QUESTION

The OP does not want to provide details, when I asked he said led's, when I proposed a simple solution for led's he said it was not led's. In my experience, when a poster is not willing to give details, they want to get free design work for their commercial project. Free Design Work For Commercial ...
by tlfong01
Sat Mar 09, 2019 11:12 am
Forum: HATs and other add-ons
Topic: I2C I/O PORT EXPANDER QUESTION
Replies: 37
Views: 2683

Re: I2C I/O PORT EXPANDER QUESTION

tlfong01 wrote:
Sat Mar 09, 2019 8:09 am

EL817C youtube

https://youtu.be/EC-zXCJIfp4 (youtube)
...
by tlfong01
Sat Mar 09, 2019 8:09 am
Forum: HATs and other add-ons
Topic: I2C I/O PORT EXPANDER QUESTION
Replies: 37
Views: 2683

Re: I2C I/O PORT EXPANDER QUESTION

tlfong01 wrote:
Sat Mar 09, 2019 4:00 am

EL817C Assembly and Testing Notes

...
by tlfong01
Sat Mar 09, 2019 4:00 am
Forum: HATs and other add-ons
Topic: I2C I/O PORT EXPANDER QUESTION
Replies: 37
Views: 2683

Re: I2C I/O PORT EXPANDER QUESTION

EL817C Current Limiting Resistor Calculation Notes My lazy hobbyist quick and dirty calculation is summarized below. The current limiting resistor value of 1k should be OK . Update 2019mar11hkt1523 I used an adjustable voltage regulator as a signal source to verify that EL817C is off when signal is...
by tlfong01
Sat Mar 09, 2019 3:06 am
Forum: HATs and other add-ons
Topic: I2C I/O PORT EXPANDER QUESTION
Replies: 37
Views: 2683

Re: I2C I/O PORT EXPANDER QUESTION

1. output must be 5 V... 2. LED as an example but could be RELAY or ACTUATOR ... Logic Level Converter and Optoisolator For [1], I would suggest you to use a logical level converter, such as TSX010n, to shift up Rpi GPIO signals from 3V3 to 5V0. This way you also protect Rpi, because TSX010n would ...

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