reception after reflecting off of a target, using the known speed of light. the LLv4 contains a nRF52840 SoC from Nordic Semiconductor. This is an Arm Cortex-M4 processor paired with extensive memory availability in both flash and RAM, 1 MB/256 KB respectively. It has a 2.4GHz multiprotocol radio and with the use of the S340 SoftDevice, the LLv4 supports Ultra Low Power wireless technologies ANT and Bluetooth 5 LE.
Pin Description Functionality Details GPIO A TRIGGER Trigger Measurement Toggle to start a distance measurement. The LLv4 will start a distance measurement on either the rising or falling edge. If a distance measurement is triggered while the device is busy, the requested measurement will be ignored. GPIO B MONITOR LLv4 Status Indicates when the LLv4 is busy. If low, the LLv4 is idle and is ready to start a distance measurement. If high, the LLv4 is busy taking a distance measurement.
I2C Protocol Information The sensor module has a 7-bit slave address with a default value of 0x62 in hexadecimal notation. The effective 8 bit I2C address is 0xC4 write, 0xC5 read. The device will not respond to a general call. • The ACK and NACK items are responses from the master device to the slave device. • The last NACK in the read is optional, but the formal I2C protocol states that the master shall not acknowledge the last byte.
3 The master initiates a new start condition, which consists of 1 The master sends one or more 8-bit data blocks to the LIDAR 4 5 2 6 7 8 the slave address with the read bit set (one state). The master reads one or more data bytes in succession. The LIDAR device sends an acknowledge bit to the master when it receives a valid address. The master releases the SDA data line with continued clocking of the SCL line. The master strobes the acknowledge bit and continues the read cycle.
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