Hi! I was looking for ultrasonic sensors like the HC-SR04 but ones that are quite small. I found quite a few, but they seem to cost $20~35, unlike a generic HC-SR04 which is under $10. I'm making multiple iterations of my project and it would be nice to save money while doing so.
Basically, I need an ultrasonic sensor under $20. I don't need accuracy or a long range. Any suggestions? Thank you.
but ones that are quite small.
Define "quite small".
Hello there!
I have used the APDS9960 sensor for several months and it is fairly decent. It is a combination of directional IR, color, and proximity sensors that can work for several projects. I am not sure what you are trying to use the ultrasonic sensor for, but perhaps the apds9960 can act in the interim. The sensor is a 3.3V board, so you may need logic level converting to control it, depending on what board you have. Give the link above a read and let me know what you think.
incompletemission:
unlike a generic HC-SR04 which is under $10.
You are shopping wrong. 
Go look at https://www.aliexpress.com
They have the HC-SR04 in the $0.75 range.
PaulS:
Define "quite small".
A small footprint. Basically half of a generic HCSR04.
bos1714:
Hello there!I have used the APDS9960 sensor for several months and it is fairly decent. It is a combination of directional IR, color, and proximity sensors that can work for several projects. I am not sure what you are trying to use the ultrasonic sensor for, but perhaps the apds9960 can act in the interim. The sensor is a 3.3V board, so you may need logic level converting to control it, depending on what board you have. Give the link above a read and let me know what you think.
That looks pretty good. Do you know the range for it?
vinceherman:
You are shopping wrong.
Go look at https://www.aliexpress.com
They have the HC-SR04 in the $0.75 range.
Oh nice. Thanks for the bookmark!
I am not sure as to the range. Sparkfun lists the range of the sensor to be from 4 to 8 inches, but from my experience, that range is horsepucky. I would take a look at the datasheet from the company to see if it can answer any questions.
Hello,
I need an ultrasonic sensor under $20
why dont you make DIY ultasonic? without it module, but just use the reciever parts from it.