DIGWDF ESP/XBee Snap-In Manuale d'uso - Pagina 8
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Stampa la paginaUsing the Snap-In as a transmitter (XBee Only)
The Snap-In works very well as a main transmitter in an XBee
network and can be powered directly from the computer's USB
port. (Note: The ESP module cannot be used in transmit mode.)
Use an USB->TTL adapter at the computer, connecting it to
the Snap-In as follows:
o TTL +5v to Snap-In pin 1
o TTL GND to Snap-In pin 3
o TTL TX (data out) to Snap-In pin 4
o
Install the 3.3 Zener, the 2-pin XMIT header and
the jumper shunt on the header. The 1x4 stackable
headers are not needed.
Radio Configuration
It is not possible to address all the possible radio-related configuration options in this user guide
for there is plenty of other documentation available about configuring XBee and ESP8266 modules.
Using an external power supply
An external 5vdc power supply or wall wart of adequate current capacity can be used to power the
adapter; be sure to connect the ground connection of the external supply to both the ground
connection of the adapter and the ground of the controller. As both the XBee radio and the ESP-01
module are 3.3vdc devices, you may alternately power the adapter with a 3.3vdc power supply in
lieu of either the UA78M33 or LM1117T regulators by soldering the power supply directly to the
snap-in at the appropriate pads where the voltage regulator would be.
Troubleshooting
If you make the proper connections to the controller, almost any other issues you might encounter
are either power-related (i.e. not enough voltage or current available to adequately power the
radio) or configuration issues with the radio's wireless network which includes radio configuration
options, antenna orientation, distance from the transmitter, intervening obstacles, etc. – all things
that are well beyond the scope of this user guide.
Current requirements: an XBee radio in receive mode typically requires about 50ma of
current; in transmit mode, it can require upwards of 250ma of current. The XBee can also
function between 2.8-3.4 volts. The ESP8266 module requires about 230-250ma of current
all the time and is less tolerant of voltage variances. Make sure that the controller that is
being used to power the adapter can supply adequate power.
voltage or current:
transmitter/network and the result is usually missed commands or an out-of-sync situation
or possibly total unresponsiveness.
Voltage testing:
o On the 5-pin header, the voltage between pins 1-3 should be 5vdc,
or close to it.
o The voltage between pins 2 and 3 of the UA78M33 regulator
should be 3.3vdc or close to it, regardless of which regulator is
installed. If the LM1117T regulator is used, the voltage between
the radio will not be able to maintain solid communication with the
DIGWDF XBee/ESP Snap-In Assembly & User Guide – v 20170308 -Page 8
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