MPU6050 registers reading 0
Posted: Mon Oct 05, 2015 7:37 pmI'm doing some tests with a MPU6050 accelerometer but the accelerometer and temperature registers return 0 (I have not tested the gyroscope registers). When this happens I still can read the correct values out of the Power Management 1 register (it gives me value 64) and the Who Am I register (I have not tried others - it gives me value 104).
Do I need some king of inizialitazione function?
On the initialization function I'm resetting the MPU6050 by setting the appropriate bit on the Power Management 1 register and waiting for it to go back to 0 then I'm writing 0x00 to this same register in order to clear the SLEEP bit.
This is the second time I'm trying to work with this accelerometer and both time I faced this problem. The problem shouldn't be the accelerometer itself because I have a friend running the same code on another accelerometer with the same results.
Moreover with arduino and this code: http://playground.arduino.cc/Main/MPU-6050
The mpu6050 works great, but with NodeMCU devkit v1.0 and Lua firmware it doesn't.
I'm out of ideas.
Here's the code I'm using to read the temperature registers according to the MPU6050 registers map ( https://www.olimex.com/Products/Modules ... _rev_4.pdf ) :
Do I need some king of inizialitazione function?
On the initialization function I'm resetting the MPU6050 by setting the appropriate bit on the Power Management 1 register and waiting for it to go back to 0 then I'm writing 0x00 to this same register in order to clear the SLEEP bit.
This is the second time I'm trying to work with this accelerometer and both time I faced this problem. The problem shouldn't be the accelerometer itself because I have a friend running the same code on another accelerometer with the same results.
Moreover with arduino and this code: http://playground.arduino.cc/Main/MPU-6050
The mpu6050 works great, but with NodeMCU devkit v1.0 and Lua firmware it doesn't.
I'm out of ideas.
Here's the code I'm using to read the temperature registers according to the MPU6050 registers map ( https://www.olimex.com/Products/Modules ... _rev_4.pdf ) :
Code: Select all
-- Reading MPU6050 temperature (65 & 66 registers) value through I2C
id=0 -- bus ID
sda=5 -- D5
scl=6 -- D6
mpu6050_addr=104
i2c.setup(id,sda,scl,i2c.SLOW)
-- I'm not using write_reg
function write_reg(dev_addr, reg_addr, reg_val)
i2c.start(id)
i2c.address(id, dev_addr, i2c.TRANSMITTER)
i2c.write(id, reg_addr)
i2c.write(id, reg_val)
i2c.stop(id)
end
--write_reg(mpu6050_addr, 107, 0)
function read_reg(dev_addr, reg_addr)
-- WRITING
i2c.start(id)
i2c.address(id, dev_addr, i2c.TRANSMITTER)
i2c.write(id, reg_addr) -- writing reg_addr in dev_addr
i2c.stop(id)
-- READING
i2c.start(id)
i2c.address(id, dev_addr, i2c.RECEIVER)
c=i2c.read(id, 1) -- reading dev_addr (1 byte)
i2c.stop(id)
return c
end
x=string.byte(read_reg(mpu6050_addr, 65))
y=string.byte(read_reg(mpu6050_addr, 66))
sleep_reg=string.byte(read_reg(mpu6050_addr, 107)) -- gives me 64 = 1000000
print(sleep_reg .." ".." Temperature: " .. x .. y)