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Esp-01 01s __full__ ✦ Instant Download

The 2x4 pin header is the Achilles' heel of this module—it is not breadboard-friendly. Here is the pinout (looking at the top, with the antenna facing away from you):

When you use Serial.begin() , GPIO1 (TX) and GPIO3 (RX) are taken over by serial communication. If you need extra pins, disable serial debugging after boot using Serial.end() . You will then have a total of 3 usable GPIOs (GPIO0, GPIO2, GPIO3/RX). esp-01 01s

DHT dht(DHTPIN, DHTTYPE); WiFiClient espClient; PubSubClient client(espClient); The 2x4 pin header is the Achilles' heel

pull-ups on the RST , GPIO0 , and CH_PD (Enable) pins. This allows the module to enter boot mode stably at power-up without needing external resistors on a breadboard. GPIO3/RX). DHT dht(DHTPIN