By default the flash is empty. Follow the procedures below to download the programs into the
flash.
1.
Pull IO15 and IO0 low, leave IO2 dangled to set the module to work under UART Download
mode.
2.
Download the programs into Flash with ESP Flash Tool (Refer to “ESP Flash Tool User
Manual”).
3.
After downloading the programs into Flash, pull down IO15 to low-voltage level, keep IO2
dangled, and pull up IO0 to high-voltage level. The module is then shifted from UART
Download mode to the Flash Boot mode.
4.
Power on the chip, the programs will be read and executed during the initialization.
——🔚
3.2.
DIP Module ESP-WROOM-01
The size of the DIP module is 18 mm x 19 mm. The Flash type applied is a SPI flash packed in
SOP8-150 mil. The antenna used is a 1 dBi metal antenna. The 2.00 mm double pitch applied
can be both vertical or straight, depending on specific applications. Refer to Table 6 for pin
definitions of this module.
Notes:
1.
Connect the 3.3V power-supply pin to an external 3.3V power source, for 3.3V is the power-
supply for both analog circuit and digital circuit.
2.
EN pin is Wi-Fi enable pin. Set EN pin high for normal working.
3.
SMD Module features two working modes: UART Download mode and Flash Boot mode. In UART
Download mode, programs can be written into the Flash or Memory by flash tool. If the
programs are burnt into the Memory, the programs can run only when the device is powered on.
Once the device is powered off, the programs in the Memory will be erased. However, when the
programs are burnt into the Flash, they will be stored and can be invoked and used at any time.
4.
Before the module is powered on, pin GND RXD TXD should be lead out and be connected with
USB to TTL serial cable (FT232 is suggested) to download, print log and communicate.
5.
The whole operating process can be examined through the log information printed by UART
interface. If the programs written into the Flash do not function in the right way, check the initial
settings of the working mode through logs printed from a serial port.
6.
Serial printing tools (for example, SecureCRT) and flash tool cannot open the serial port
simultaneously.
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