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Please pay attention to the correct connection of the positive and negative poles of the power supply, such as reverse
connection may cause permanent damage to the module;
Please check the power supply to ensure that between the recommended supply voltages, if the maximum value is
exceeded, the module will be permanently damaged;
Please check the stability of the power supply, the voltage can not fluctuate sharply and frequently;
When designing the power supply circuit for the module, it is often recommended to retain more than 30% of the margin,
which is conducive to long-term stable work;
The module should be as far away as possible from the power supply, transformer, high-frequency wiring and other parts
with large electromagnetic interference;
High-frequency digital traces, high-frequency analog wiring, power traces must avoid the bottom of the module, if it is
really necessary to pass under the module, assuming that the module is welded in the Top Layer, the Top Layer
of the
module contact part
is covered with copper (all copper is laid
and
well grounded), must be close to the digital part of
the module and routed in Bottom Layer
；
Assuming that the module is soldered or placed in
the
Top
Layer, it is also wrong to route the wire at will in the
Bottom Layer or other layers, which will affect the spurious and receiving sensitivity of the module to varying degrees;
Assuming that there are devices with large electromagnetic interference around the module will also greatly affect the
performance of the module, it is recommended to stay away from the module appropriately according to the intensity of
interference, and if the situation permits, appropriate isolation and shielding can be done;
Assuming that there are traces with large electromagnetic interference around the module (high-frequency digital,
high-frequency analog, power wiring) will also greatly affect the performance of the module, it is recommended to stay
away from the module appropriately according to the intensity of interference, and if the situation permits, appropriate
isolation and shielding can be done;
If the communication line uses 5V
level,
1k-5.1k
resistors
must be connected in series (not recommended, there is still a
risk of damage);
Try to stay away from some TTL
protocols
that
are also
2.4GHz
at the physical layer
, such as USB3.0;
The antenna installation structure has a great impact on the performance of the module, so it is necessary to ensure that
the antenna is exposed and preferably vertically upward;
When the module is installed inside the case, a high-quality antenna extension cable can be used to extend the antenna
to the outside of the case;
The antenna must not be installed inside the metal case, which will greatly weaken the transmission distance.
Chapter 11 Frequently Asked Questions
11.1 The transmission distance is not ideal
When there is a straight-line communication barrier, the communication distance will be attenuated accordingly;
Temperature, humidity, and co-frequency interference will lead to an increase in the communication packet loss rate;
The ground absorbs and reflects radio waves, and the test effect close to the ground is poor;
Seawater has a strong ability to absorb radio waves, so the seaside test effect is poor;
If there is a metal object near the antenna, or placed in a metal case, the signal attenuation will be very serious;
power register setting error, air rate setting too high (the higher the air speed, the closer the distance);
At room temperature, the low voltage of the power supply is lower than the recommended value, and the lower the
