3pcs KY-039 Finger Detection Heartbeat Sensor Module Finger Detect Measurement
New
Shipping
Standard courier shipping from R30
R30 Standard shipping using one of our trusted couriers applies to most areas in South Africa. Some areas may attract a R30 surcharge. This will be calculated at checkout if applicable.
Check my rate
Check my rate
Ready to ship in
The seller has indicated that they will usually have this item
ready to ship within 15 business days. Shipping time depends on your delivery address. The most
accurate delivery time will be calculated at checkout, but in
general, the following shipping times apply:
Standard Delivery
| Main centres: | 1-3 business days |
| Regional areas: | 3-4 business days |
| Remote areas: | 3-5 business days |
Returns
Get it now, pay later
Seller
Buyer Protection
Product details
Condition
New
Location
International
Bob Shop ID
615113773
Description: ? This project uses bright infrared (IR) LED and a phototransistor to detect the pulse of the finger, a red LED flashes with each pulse. Pulse monitor works as follows: The LED is the light side of the finger, and phototransistor on the other side of the finger, phototransistor used to obtain the flux emitted, when the blood pressure pulse by the finger when the resistance of the phototransistor will be slight changed. We chose a very high resistance resistor R1, because most of the light through the finger is absorbed, it is desirable phototransistor sensitive enough. Resistance can be selected by experiment to get the best results. The most important is to keep the shield stray light into the phototransistor. For home lighting that is particularly important because the lights at home mostly based 50HZ or 60HZ fluctuate, so faint heartbeat will add considerable noise. ? Package includes: ? 3 x Finger Measuring Heartbeat Sensor Module
