The sensor is expecting a 5V signal on the trigger input and generates a
5V signal on echo.
You are feeding a 3.3V signal from the BBB and accepting a 5V signal
from the sensor.
Will the output of the BBB, 3.3V, be seen as a 5V input by the sensor?
Will the 5V signal from the sensor fry the gpio pin which is expecting a
max voltage of 3.3V?
This is just looking at the voltages and not considering currents, dig
out the spec sheets for the sensor to see what the voltage/currents are
that it is expecting.
The MOSFET level shifters will transform the 3.3V to 5V and vice versa.
Transistors/resistors will do the same operation.
Chad
On 5/7/15 10:45 AM, claudiu [email protected] wrote:
Well yes i do know that the BBB is a 3.3v with a 4-6 mA output.
Therefore I have used the following configuration:
|* TRIGGER P8_12 gpio1[12] GPIO44 out pulldown Mode: 7
* ECHO P8_11 gpio1[13] GPIO45 in pulldown Mode: 7 *** with R
1KOhm
* GND P9_1 or P9_2 GND
* VCC P9_5 or P9_6 VDD_5V(from BBB)
|
|but am I right ? |
On 7 May 2015 at 16:23, doog <[email protected]
<mailto:[email protected]>> wrote:
On Thursday, May 7, 2015 at 1:44:57 AM UTC-7, claudiu <clip> wrote:
For the sensor's VCC im using the VDD_5V from BBB.
and you do know that the BBB is a 3.3v device so level shifting is
probable?
Doug
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