[HY-SRF05 Precision Ultrasonic Sensor ](https://www.micros.com.pl/mediaserver/M_HY-SRF05_0003.pdf) Data Sheet
### E L E C T R O N I C S
How it Works?
A sensor like the HC-SR04 works similarly to a bat’s sonar: by sending out an ultrasonic pulse that bounces when it encounters a barrier, like a wall, a person, or an object. After it bounces, the pulse returns to the sensor, which computes the distance to the barrier based on the time it took for the pulse to return.
The HC-SR04 uses two specialized pins to accomplish this, in addition to its power and ground pins: a “trigger pin,” which sends out the signal, and an “echo pin,” which receives the returning signal after it bounces.
[Use an Ultrasonic Sensor to Control Neopixels With Arduino](https://www.instructables.com/How-to-Use-an-Ultrasonic-Sensor-to-Control-Neopixe/).This was a helpful tutorial to get an idea where to put everything. However the code did not work for me so I had to find my own solution and write new code.
[Arduino controlling Neopixel with Sensor](https://www.youtube.com/watch?v=OPglncvHzQo)
[Ultrasonic sensor motion sensing](https://michellevossen.com/blog/fablab/2021/11/23/ultrasonic-sensor-motion-sensing.html) by Michelle Vossen
[Detecting movement direction with two ultrasonic distance sensors](https://www.sensingthecity.com/detecting-movement-direction-with-two-ultrasonic-distance-sensors/)
[Intro to ATTiny](https://vimeo.com/781182805/91c5fb866c) Fabricademy 2022-23
[TTiny and Touch sensors part 2](https://vimeo.com/781557472/b636603819) Fabricademy 2022-23
#### **D E S I G N**
My design for the circuit. It is in two parts, the right side is one circuit and the left is a mirrored version.
The idea is to have the sensors at the knees and the circuit as one continuous strip.
#### **I S S U E S**
NOTE: posible issues that could arrise
- Focus on direction and ensure **NEOPIXELS IN CORRECT DIRECTION!**
- Connections must be **SECURE!**
- Neopixels arranged in series, if one connection is lost, it will interrupt the others
As I plan to have many joins, it will be impotant to have well soldered and secure connections
[Soldering Strips](https://learn.adafruit.com/make-it-glow-how-to-solder-neopixels-a-beginners-guide/soldering-strips) has some tips and tricks on soldering neopixel strips and wires.
Tips and Tricks on [How to Solder](https://www.instructables.com/How-to-Solder-Tips-and-Tricks/)
[Aslı Aydın Aksan](https://asliaydinaksan.github.io/) has some information on soldering tips for [PCB Assembly](https://asliaydinaksan.github.io/2022/10/03/pcb-assembly.html)
I started to solder NeoPixels trying to make **very stable connections**
M E T H O D
1. Using pin, poke **hole** in each connecction.
2. Strip a bit of **wire** and place through hole.
3. Cut piece of small **shrink tube** and place over wire.
4. Using soldering iron **heat** up wire/connection for 2/3 seconds, then melt **solder** into connection
5. Place shrink tube over connection, heat and tighten to form strong bond.
Developing on a previous technique that I have used over the years to create pleates, which consists of creating 2 accordion moulds, placing a piece of fabric in the middle and treating it with heat.
