Dynamometer for Post Stroke Rehabilitation

Description

The set consists of 4 Strain Gauges, 24 bit ADCs, device with LCD or LED display and a programm for windows. The force sensors have +- 50 N force range and 0.01 N resolution. We use 24 bit ADCs HX-711. The summe price of it all is no more than $100. The force of finger press can be seen on device display and on PC (Windows) screen. An open-source code for the Arduino environment is covered by the GPL.

Details

Introduction. More than 50% of stroke survivors have the secondary Post stroke in the next 5 years. We made the Differential Dynamometer (DifDyn) for post stroke rehabilitation.
The objective of the project. Post stroke rehabilitation can be done with very expensive Exoskeletons or some kind of joystick devices (kind of a computer games). The use of joystick is impossible for heavy patients with weak muscle control. We have to make simple chip open source device to measure fingers forces.
DifDyn can measure the forces in the range ± 5000 Gramm (1 Gramm resolution). We try to construct the devise using very chip Arduino Nano controller and Arduino Shields.
3 types of Sensor Board are constructed, using plywood and plastic cutting boards (breadboards).
The DifDyn has a 0.36 inch LED, 4x4 digits. The data can be shown in 4- digit format or as a bar in log scale. It is also LCD Display version. The program code is free and it is open source Arduino IDE code.
The data can be seen in PC monitor. The program is free. The program shows 4 values of pressing forces (in Gramms), the 4 bars in log scale. The data can be stored in file as a text or in electronic table format. The data can be shown, stored and loaded as a graph diagram.
3 types of sensor board are tested and described- simple plywood board, plastic breadboard, and sandwich - type 3 -layer sensor board using plastic breadboards.

Files

BuildInstruction4.pdf

The last Build Instruction. Include description of a 3- layer sandwich sensor board.

Adobe Portable Document Format - 1.74 MB - 08/29/2017 at 09:49

Preview

BuildInstruction3.pdf

Build Instruction - description of a simple plywood board and model board are added.

Adobe Portable Document Format - 1.74 MB - 08/23/2017 at 22:25

Preview

InstructionEng.pdf

Instruction how to launch and work DiffDyn4 PC monitor program.

Adobe Portable Document Format - 367.48 kB - 08/06/2017 at 21:18

Preview

DifDyn4Engl.zip

Zip file of PC Monitor program in English for Windows PC. Unzip and run, no installation is needed. The description is on InstructionEng.pdf file in English (see the file here and on a Git Hub).

x-zip-compressed - 2.41 MB - 08/06/2017 at 21:12

Download

t2.hex

hex binary file for download to atmega mega328pu without boot.

hex - 42.44 kB - 08/04/2017 at 01:12

Download

Components

1 × Controller Arduino nano R3 CH340 992-ARD-NANO30NP

4 × 24 bit ADC shild HX-711 shild 474-SEN-13879

2 × 8 digits LED shild max7219 0,36"LED shild

4 × Strain Gauge Kitchen Scale Sensor 5 kG

2 × Push button Any push button- one momentary and one toggle

Project Logs

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Example of simple sample without box
Sergei V. Bogdanov • 09/01/2017 at 10:11 • 0 comments

Simple sample without box is shown. It is usefull for adjustment and learinig purposes. And it work! Electronic components are mounter on a tray, the sensors are mounter on a plywood board.
Sandwich- like Sensor Board is constructed and tested
Sergei V. Bogdanov • 08/29/2017 at 19:18 • 0 comments

We made a drawing of a palm and the sensors

We use plastic breadboard for upper and lower boards

1- 1 - Sensors, 2- Screws M5 (fasten sensors to the board), 3- Screws M4 (fasten sensors to the moving moving base, 5 - cable to ADC, 6- Moving base for fingers
1- Moving bases, 2- Ribbon Fabric rings, 3- plastic fastener
New sensor board is constracted
Sergei V. Bogdanov • 08/29/2017 at 09:43 • 0 comments

We constucted new type of sensor board. The new sensor board is a sandwich with base breadboard, sensor layer and upper bearing breadboard. The description and drawings are in the new buildinstruction Build Instruction ver. 4.0
Instruction is added - how to assemble sensor board
Sergei V. Bogdanov • 08/23/2017 at 22:29 • 0 comments

3 instruction items are added- how to assemble sensor board using plywood, plastic cutting board and closed sensor board.
English Monitor Program and English instruction added.
Sergei V. Bogdanov • 08/06/2017 at 21:46 • 0 comments

Program for Windows Computer - DiffDyn4. Program is free shareware. It need no installation, just copy to writable disk and work. Instruction also is added - InstructionEng.pdf. Take a take.
Arduino Code for LED version is added
Sergei V. Bogdanov • 08/04/2017 at 00:08 • 0 comments

Arduino Code for LED version is added to "Files" and GitHub.
Executable programm Visualizer for Win is added. The program need no installation, just copy all the directory to writable disc and work. Some buttons have russian titles, it will be in English soon.
Build instruction is added to "Files".
New Step-by-Step build instruction is on git hub
Sergei V. Bogdanov • 07/28/2017 at 22:31 • 0 comments

New Step-by-Step build instruction is on git hub
Step-by-Step instruction is on Git Hub from now
Sergei V. Bogdanov • 07/27/2017 at 22:12 • 0 comments

You can download build instruction from github Download from here file BuildInstruction.pdf
Github docs are added
Sergei V. Bogdanov • 07/27/2017 at 11:32 • 0 comments
You can download docs and programms from Github. The latest version

Content 2017 07 27

DifDin4_Uno_LCD_Engl00.JPG Device schematics in graphim view, english language titles and marks

DifDin4_Uno_LCD_Engl00.spl7 Device schematics in SPlan format, english language titles and marks

DifDinLCD.ino code for Arduino IDE. Device with LCD 2x16 Display. GNU Licence

t2.hex hex file for direct load to atmel atmega328pu microcontroller (in Arduino Nano), without boot sector README.md this file
```
https://github.com/DrOnkel/DifDin.git
```
The Project descripiton is done.
Sergei V. Bogdanov • 07/26/2017 at 10:50 • 0 comments

The descripiton includes schemes, BoM, video,puctures, Arduino IDE code.

View all 10 project logs

Build Instructions

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You can download Instrucitons "BuildInstruction4.pdf" (1.7 MBytes) from the Files here

You can download also Instrucitons "BuildInstruction4.pdf" from the repositary Build Instruction v.4

You can see the main stages of construcion here. Schematics.

We construct two versions of the devise. The firsto version include LCD and here is schematics

Here is schematics of the device with LED Display. We pay attention to this version becouse LED Display is more usable. You can consruct the device with LCD Display the same way. The only difference is size and situation of Display.

Housing

We use ready box (housing) G1168G Gainta. You only need to make a slot for the LED or LCD display.

Assembled devise is shown here, with

1 Controller
2 24 bit ADC shields
3 8 digits LED shields
5 Push button
6 Box for device
7 DB25F connector
12 0.1 uF 16 V capacitors
13 PCB for GND and VCC connections
14 3300 uF 16 V low ESR capacitor

Discussions

rraetz wrote 11/13/2020 at 20:31

Nice project! Do you plan to use it mainly as an assesment device or are you developing any interactive games that could potentially be used for rehabilitation training?

Are you sure? yes | no

dreschel wrote 08/01/2017 at 18:36

Thank you very much!

Bill

Are you sure? yes | no

Sergei V. Bogdanov wrote 08/01/2017 at 18:55

OK. New version of firmware for Arduno/ Genuino will be published in two days. If it is interesting I can publish *.hex code for Atmega328p.

Are you sure? yes | no

dreschel wrote 08/01/2017 at 18:26

Hi, The build instruction pdf doesn't seem to be on GitHub yet. Or am I missing something.

The ZIP file only contains the license info.

Looking forward to seeing this project, as I have known a few stroke victims.

Bill

Are you sure? yes | no

Sergei V. Bogdanov wrote 08/01/2017 at 18:32

https://github.com/DrOnkel/DifDin/tree/DifDynV_02

Are you sure? yes | no

Sergei V. Bogdanov wrote 07/27/2017 at 00:06

The code is made in Arduino IDE. The source code for the Arduino environment is covered by the GPL.

Are you sure? yes | no

Dynamometer for Post Stroke Rehabilitation

Description

Details