Detect Reflective Surfaces with a GP2S700HCP from Sharp Corporation

Finding out whether things are nearby is a classic engineering problem – OEMSecrets already introduced you to a wide range of possibilities. Now, Sharp sends a classic optoreflective system into the fray.

From a technical point of view, the part is quite simple. It combines a IR diode and a phototransistor in a single housing. In addition to that, a raisin cover is placed above the assembly to minimize the impact caused by ambient visible light.

The internal schematic of the GP2S700HCP could not be easier

Actual range of the sensor is quite difficult to ascertain – the datasheet limits itself to stating “Optimal Sensing Distance : 3mm”, but also mentions that the part has an extraordinarily large range for this product class.

This is also reflected in the opto-electrical properties. The forward voltage of the infrared diode is said to be between 1.2 and 1.4 Volts when a current of 20mA flows. Absolute maximum current is in the range of 50mA, which – obviously – also leads to a higher detection range.

Physical placement, on the other hand, is simple. Our figure shows the two “eyes” of the part next to one another, with surface mount soldering points at the bottom providing electrical access to required signals.

The two lenses are placed on an SMD carrier

Recent Articles
The Hitchhiker’s Guide to PCB Design
Want to create a solid, manufacturable PCB the first time? Get the only eBook you will ever need to upgrade your PCB knowledge and launch your... Read Article
Secure your supply with Future Electronics
Find what you need faster Hundreds of thousands of components. Three strategically-located Distribution Centers. ONE global IT infrastructure. Find what you need faster with access anywhere,... Read Article
Save 10% on Orders $500 or More
Promo code is valid for saving 10% on orders of $500 or more. Offer does not apply to products from Adafruit, DEEPWAVE DIGITAL, FTDI Chip, NVIDIA,... Read Article
Create Smaller, More Power-Efficient USB-C and USB-C Power Delivery Designs
Maxim Integrated’s extensive portfolio of ICs for USB-C and USB-C Power Delivery designs provide high levels of integration and flexibility that engineers need to create compact,... Read Article
Latest Solutions from CUI & Digi-Key
Read Article
Why Standard Products from ST are the right choice for your design projects!
Standard products matter! They are in virtually every design and you just need them right away with no fuss, no hurdles: just there.   Together with Farnell,... Read Article