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Gareth
November 07, 2018, 03:42:30 AM by Gareth
Views: 1288 | Comments: 2



Two is better than one...... (or 4 or 8 etcetcetc).

Following successful experiments with 1 single Time of Flight distance sensor mounted to Stepper, watching the scan process its seems to lend its self to setting the scan to just 180° and mount two sensors back to back to extract the whole 360°...... (or 90° scan with 4 sensors, hope you see where I am going with this :-)

Generally I2C devices come with a fixed address, so doubling up the same I2C animals with the same I2C address is not possible...... unless Slave address's are implemented.

The VL53LOX sensor has a trick up its sleeve ... the "XSHUT" pin   (aka.....
Gareth
November 07, 2018, 03:40:19 AM by Gareth
Views: 937 | Comments: 0

Time of Flight meets BlueTooth.....

Extensive testing with WiFi mesh networks proved to be not the way to go for this project... timing issues killed the progress.

Exit Wifi Mesh network goblins...... YAY

Enter the BlueTeethed Elves ....... YAY

The ESP32 has up its sleeve BlueTooth capabilities, it was a simple job to reconvert the data packets.

I must say the I am not a great fan of BlueTooth however its the first time the system appears to be pretty bombproof.

Below is current system using an ESP32 with TimeOfFlight laser module mounted to Stepper motor, transmitting data over a Bluetoot...
Gareth
July 13, 2018, 04:28:46 AM by Gareth
Views: 3486 | Comments: 8

Thought it may be of interest to document a rover platform using Stepper Motors as drive linked to an ESP32 sporting a Web gui to control movement and display Sensor data.
It will map with LIDAR, the LIDAR will be a home brew system ....still on order....

Its still early stages, however at least the mechanics and Gui are functional.
Basic Platform :-
 [ You are not allowed to view attachments ]
This consists of a 3D printed chassis (back-end still in blender) holding two stepper motors , you might notice the training wheels (springy 3D coils to keep it upright and allow platform to function in temporary mode).
Its controlled with an ESP32 with A4988 Stepper motor drivers.

...
June 17, 2018, 04:12:07 PM by k120189 | Views: 2692 | Comments: 2

with all the new variations of my beloved BoB i felt it was time for the OG to make his return.

differences from V2 include:
 "bucket head" now the lid goes on top makes it easier to pile all of your goodies inside.
 2S 18650 holder built in. finding a pack to fit was always a problem so now its built right in! with 1750-3000mah of capacity he will waddle on forever
designed for the hc-sr04 sensor for his "eyes" still but his brain has been upgraded from an arduino nano to an Wemos d1 Mini which means...
APP CONTROL! the wemos has 2 shields. 1 proto, and one power management board. giving this new design a nice neat control package, wifi, and one pack to power them all.

some things that havent chan...
June 03, 2018, 05:54:47 AM by KingBeetle | Views: 5287 | Comments: 18

Parts from China are finally starting to trickle in, and I can at least feel like I am making some progress on the build.  I received the smooth rods and bearings on Friday, and was able to partially assemble the Y-axis.  Note that the wood frame is just attached to check clearances and to see what it would look like.  No attempt has been made to position the frame front-to-back with any kind of accuracy.

I'm happy with the smoothness of the rods and bearings.  Finally the printer has a moving part! 

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