1.2.6. ESP8266EX Modules (WROOM)
Espressif offers 2 kinds of modules, SMD and DIP.
SMD:
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Figure 5: WROOM SMD Module!
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1. Refer to Figure 5 for pin definition. Module size is 11.8x15mm. Flash package is
SOP8-150mil. Refer below for usage of SMD module (Tables in section 1.2.1 for
reference):
2. Connect Pin 3V3 and VDIO to an external power source.
3. CH_PD: high.
4. MTDO: low, GPIO2 if not used may be left floating (high), GPIO0 to be switched
between high and low for Uart Download and Flash Boot mode respectively.
5. Connect GND U0RXD U0TXD, use USB to TTL serial cable to download, print log
and send data
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