BLUETOOTH POSTURE CORRECTOR FOR $20. Intro.

Many of us have suffered of back pain at some stage of our life, just have a bad looking posture standing up or may have a feeling that if you don´t correct your posture you are gonna grow some sort of hump. If you google it looks there are plenty of solutions up there but most of them either don´t work for you, look inconvenient or they are just too pricey for what it actually does.

THE BASIS:

This wearable basically is meant to be placed on your back (positioned either with double sided tape for skin or with elastic cords) and It will vibrate once you tilt too much. By a mobile phone terminal using bluetooth you can set from what angle It is gonna make the device the vibration and It is easy to stop/resume the vibrator at any time.

Some of you may come across already with a product very similar to this one which has more features, looks alright but with a 3 figure price tag. Instead someone with some basic electronics know how can do this one for a price of $20. It is dimensions are very similar to a standard 9V battery, a bit bigger than the off the shelf magic but this DIY project I think It is good value for the money.


PARTS & COMPONENTS:

-Arduino Pro mini 3V3 8 Mhz.

 

-CH340g USB to TTL converter. (UART comms)

-MPU6050 module Sensor (I2C comms)

-Vibration motor (from old mobile phone)

-BJT Transistor C1815 + (220 Ohm 1/4W Resistor for Ib)

                 

-AT-09 Bluetooth module 4.0 (UART comms)
-250mAh Lipo Battery with BMS built in.
-USB TP4056 Lithium Battery Charger module (with Rp changed to 10K Resistor)


-68K Ohm  and 22K Ohm Resistors (1/4W) for the ADC input to get the Battery level.
-Main simple Switch to deliver/interrupt power from Battery.
-2 pin Connector to hook up battery charger (optional)
-Wires and Cable Ties.

PROTOTYPING:

  

This First Prototype Video should give you and idea of the basic functioning of the device.
It is being configured and adjusted to work either for walking or being sat down. As I will show in the code description I used two SW filters to avoid any inconvenient output triggers, especially when we walk the accelerometer is sometimes all over the place, we will see how to fix that. As you may have noticed in the video the vibration motor and the led activates at the same time for better visual. And no worries about the blinking, once you firmly attach the vibrator to the whole assembly or housing the intermittent output is gone. As I said It is a Prototype.

usefulelectron@gmail.com

Location: Madrid, España

Popular posts from this blog

Steam Iron Repair. Thermal Switch.

Image
The issue that I am going to describe could be a common fault in many steams irons and getting them into a solution just can be a little bit time-consuming... (I agree, we run out of time for this things nowadays!) but It might even be seen as an interesting and non expensive task .  One day probably happened to one of us that our trustworthy steam iron stops heating up. We might think that after more than 2 years of regular use the heating element could be broken and we should consider it unfixable. If by coincidence you bumped into the same fault as me, without any doubt I think the fixing chore ritual is gonna be at least much more entertaining with this guide, I can assure you that right now!   The above photo shows what we find in our unit after removing a torx screw from the back and proceed to take the cover off the appliance. Here we can get access to another three screws more, one which hold the exposed cables with their connectors and other two screws below which kee...
Read more

You should get the products you own repaired at a reasonable cost!

eevBLAB 88 - Right To Repair Questions & Answers - YouTube Dave discuss and summarise questions and answers related to the "Right to Repair Movement". "They do things without any technological or marketing reason behind it other than to make it more difficult to repair". "They use custom parts instead of components that do the same and are available off the shelf." "Right to repair is a given in other industries like in white goods and cars. In other products It was a given but not anymore, TV´s used to have a circuit diagram when you removed the back cover." "Somehow we come into a point in society that you don´t own a product that you actually buy and you should not use unauthorise repair centers." Dave says authorise centers do board swaps, they don´t do component level repairs. "You should get the products you own repaired at a reasonable cost." "The don´t want people sharing repair information, that is ridiculous...
Read more

Workbench Lamp using recycled materials.

Image
  We all have been using portable torches run by batteries sometimes when we can not see properly in tight spaces of small things, and perhaps in different situations we come across having not enough light with one desk lamp and ended up turning on lights from the ceiling as well. Why not get a middle size desk lamp (8" tall) that works well as a torch with high brightness and serves at the same time as illumination for the dark and excluded side of your desk? Most of materials are recycled or found at a low cost. You can use same ones but I encourage everyone to make the most of the bits you may have lying around home or perhaps somebody got ones that are about to toss, why not used them for standing a useful handy light? As you can see below removing just two screws can be flat-pack!  These are the main components that worked out for me :                   12 V Power Adapter (taken from and old internet router...
Read more