Basic Operation; Hardware Design - Ebyte E19 Series User Manual

Chengdu Ebyte Electronic Technology Co., Ltd.

4 Basic operation

Hardware Design

4.1
It is recommended to use a DC stabilized power supply to supply power to the module. The power ripple coefficient

should be as small as possible, and the module must be reliably grounded;
Please pay attention to the correct connection of the positive and negative poles of the power supply. Reverse

connection may cause permanent damage to the module;
Please check the power supply to ensure that it is within the recommended power supply voltage. If it exceeds the

maximum value, it will cause permanent damage to the module;
Please check the stability of the power supply, the voltage should not fluctuate greatly and frequently;

When designing the power supply circuit for the module, it is often recommended to reserve more than 30% of the

margin, and the whole machine is conducive to long-term stable operation;
The module should be as far away as possible from power supply, transformer, high frequency wiring and other

parts with large electromagnetic interference;
High-frequency digital wiring, high-frequency analog wiring, and power wiring must avoid the bottom of the

module. If it is necessary to pass under the module, assume that the module is soldered to the Top Layer, and the top
layer of the contact part of the module is covered with copper (all copper And well grounded), it must be close to
the digital part of the module and routed in the Bottom Layer;
Assuming that the module is soldered or placed on the Top Layer, it is also wrong to randomly route the wires on

the Bottom Layer or other layers, which will affect the stray and receiving sensitivity of the module to varying
degrees;
Assuming that there are components with large electromagnetic interference around the module, it will greatly

affect the performance of the module. According to the intensity of the interference, it is recommended to stay away
from the module. If the situation permits, proper isolation and shielding can be done;
Assuming that there are large electromagnetic interference traces (high-frequency digital, high-frequency analog,

power traces) around the module, it will greatly affect the performance of the module. According to the intensity of
the interference, it is recommended to stay away from the module. Isolation and shielding;
If the communication line uses 5V level, a 1k-5.1k resistor must be connected in series (not recommended, there is

still a risk of damage);
Try to stay away from part of the physical layer that is also 2.4GHz TTL protocol, such as USB3.0;

The antenna installation structure has a great impact on the performance of the module. Make sure that the antenna

is exposed, 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 shell, which will greatly reduce the transmission distance.

Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co., Ltd.
E19-900M20S2 User Manual
8