Memory and wireless budget for a connected product
The ESP32-MINI-1-N4 packs 448 kB of ROM and 536 kB of SRAM on the ESP32 die — enough headroom to run a FreeRTOS application with a TCP/IP stack, BLE GATT server, and Wi-Fi station mode without external memory for most sensor-to-cloud payloads. Dual-protocol support for 802.11b/g/n Wi-Fi at 150 Mbps and Bluetooth v4.2 with EDR means a single module handles both high-throughput data logs and low-energy beaconing, switching between radios without a second RF front-end. The integrated trace antenna saves a PCB layout iteration — no external antenna matching network needed for basic range, though a U.FL variant exists for designs requiring an external whip or ceramic chip antenna.
Current draw and supply rail planning
Receiving current sits at 95–100 mA; transmitting draws 130–240 mA depending on output power setting and modulation — the 13 dBm max output means a 20 mW conducted power level that stays within most regional EIRP limits for 2.4 GHz ISM bands.