PiXtend V2 -L- Hardware Manual
The DHT11 / 22 sensors offered in our
o
nline
s hop
already have a pull-up and buffer
capacitor. No external circuit of the sensors is required. According to our measurements,
these DHT sensors can be operated under laboratory conditions up to approx. 25 m cable
length.
Property
Value
Comment
Type of outputs
digital output, semiconductor for DC voltage
Push-Pull
CMOS output
Output voltage
5 V DC
Nominal current
2 mA*
Nominal load
≥ 3 kΩ*
≥ 1 kΩ*
for min. 4.5 V output voltage
for 5V TTL high level
Load types
ohmic
Short circuit current
~ 15 mA*
Rated switching capacity
10 mW
Short circuit protection
yes
Short circuit against GND
Isolation
no
Status display
no
Permissible cable length
< 3 m
Table 19: Technical data - GPIO as output
Warning!
Under no circumstances may inductive loads be connected, as the
resulting voltages can damage the microcontroller when the loads are
switched off.
* This is a 5V TTL output with 300 Ω resistor in series
(as a series resistor for standard LEDs or as short circuit protection / current limitation).
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