meshtastic/docs/hardware/devices/heltec-automation/sensor/index.mdx

---
id: heltec-sensors
title: HELTEC® Plug&Play Sensors
sidebar_label: Sensors
sidebar_position: 2
---

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## Heltec Capsule Sensor Rev. 3.0

- **MCU:**
  - ESP32-S3FN8 (WiFi & Bluetooth)
- **LoRa Transceiver:**
  - Semtech SX1262
- **Frequency Options:**
  - 433 MHz
  - 470 - 510 MHz
  - 863 - 870 MHz
  - 902 - 928 MHz
- **Connectors:**
  - Magnetic suction interface
  - Antenna:
    - Dedicated 2.4 GHz SMT antenna for WiFi/Bluetooth
    - Dedicated SMT antenna for LoRa

### How to upload firmware

:::info
Capsule Sensor V3 uses WirelessBoot mode to upload firmware, exchange information, and print logs through WiFi.
That is, whether you update the firmware locally or via the Web, You need to get the device into WirelessBoot state first.
:::
Refer to this link for how to upload firmware for Capsule Sensor V3: [**Wireless Boot**](https://docs.heltec.org/en/node/esp32/capsule_sensor_v3/wireless_boot.html#).

### Touch button/Physical button differences

:::warning
Because the touch button is easy to accidentally activate while close to metal or in your pocket, Heltec has discontinued production of this version. However, a small number of samples have entered the market.
:::

- Button differences
  ![Capsule Sensor V3 Button](/img/hardware/heltec/capsule-sensor-v3-button.webp)
- Other hardware differences
  1. Removal of [FDG6322C](https://www.mouser.com/datasheet/2/308/1/FDG6322C_D-2312203.pdf) (a dual N & P channel FET) from the physical-button version.
  2. Antenna filter values physical-button version (L11 = 1.8pF, C15 = 2.7nH, C24 = 1.8pF) align more closely with ESP32-S3 reference design than touch-button version (L11 = 1.6nH, C15 = 6.9pF, C24 = 2.4pF).

### Features

- Meshtastic preinstalled.
- Built-in battery.
- Sensor replaceable.

### Pin

- Connector:
  - Model name: [DF12NB(3.0)-10DS-0.5V(51)](https://resource.heltec.cn/download/Heltec%20Capsule%20Sensor%20V3/Connector.pdf)
  - Pin:
    ![Capsule Sensor V3 pin](/img/hardware/heltec/capsule-connector.webp)
- More pin definitions please refer [Schematic Diagram](https://resource.heltec.cn/download/Heltec%20Capsule%20Sensor%20V3/Capsule_Main_Esp32_Schematic_Diagram.pdf)

### Resources

- Firmware file: `firmware-heltec_capsule_sensor_v3-X.X.X.xxxxxx.bin`
- Purchase links
  - International
    - [Heltec](https://heltec.org/project/heltec-capsule-sensor-v3/)
    - [AliExpress](https://www.aliexpress.us/item/3256805256690400.html)

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