? 2017 rohm co.,ltd . bh1790glc - evk - 001 software document feb/07/2017 sensor application g
p. 1 ? 2017 rohm co.,ltd . optical sensor for heart rate monitor (bh1790glc) sketch file(bh1790glc.ino) ? setup function ? setup serial function(115200bps) to output log data on serial monitor ? initialize i2c( wire.begin function) and setup i2c clock(400khz) ? initialize bh1790glc ? setup 32hz timer and start ? loop function ? check the flag about 32hz period ? get the values optical sensor data with led on/off and display them ? timer_isr function ? function to execute @ 32hz interval
p. 2 ? 2017 rohm co.,ltd . optical sensor for heart rate monitor (bh1790glc) library files (bh1790glc.h, bh1790glc.cpp) ? c onstructor ? do nothing ? init function 1. read and check part_id, pid and manufacturer_id register value 2. write to meas_control1 register (rdy=1, led_lighting_freq=128hz, rcycle=32hz) 3. write to meas_control2 register (led_en[1:0] = 00, led_on_time=0.3ms, led_current=10ma) 4. write to meas_start register (meas_st=1) ? get_rawval function ? get the 4bytes raw value from register address 0x54 ? get_val function ? execute get_rawval function ? create optical sensor data with led on/off ? write function ? general write function for bh1790glc ? read function ? general read function for bh1790glc
? 2017 rohm co.,ltd .
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