PULSE RATE SENSOR

Flex sensors are usually available in two sizes. One is 2.2 inch and another is 4.5 inch. Although the sizes are different the basic function remains the same. They are also divided based on resistance. There are LOW resistance, MEDIUM resistance and HIGH resistance types. Choose the appropriate type depending on requirement.  Here we are going to discuss 2.2inch Flex sensor that is FS-L-0055.

The raindrop sensor module is used for rain detection. It is also for measuring rainfall intensity. The module includes a rain board and a control board that are separate for more convenience. It has a power indicator LED and an adjustable sensitivity though a potentiometer. The module is based on the LM393 op amp. It includes a printed circuit board (control board) that “collects” the rain drops. As rain drops are collected on the circuit board, they create paths of parallel resistance that are measured via the op amp. The lower the resistance (or the more water), the lower the voltage output. Conversely, the less water, the greater the output voltage on the analog pin. A completely dry board for example will cause the module to output five volts.

Processor: Broadcom BCM2837 Processor Quad core A53 (ARM v8) 64-bit SoC
Memory: 1GB LPDDR2 SDRAM
Bluetooth: Cypress BLE chip 2.4Ghz/5.0GHz IEEE 802.11ac
Ethernet: Gigabit Ethernet over USB 2.0 (300Mbps max)
WIFI: 2.4GHz and 5GHz IEEE 802.11.b/g/n/ac wireless LAN
USB: Four USB 2.0 ports
Connection: GPIO Header 40-pin
HDMI: 1 x full size
Video: MIPI DSI display port, MIPI CSI camera port & 4 Pole stereo output and composite video port
Multimedia: H.264, MPEG-4 decode (1080p30). H.264 encode (1080p30). OpenGL ES 1.1, 2.0 graphics.
Storage: microSD card slot for loading operating system and data storage
Power: USB connector for 5.1V / 2.5A dc
POE enabled.