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A standalone ESP32-CAM can send a low-resolution picture over a radio link by converting the captured image into SSTV audio. The project by Dzl TheEvilGenius outputs PWM-modulated audio on GPIO4, which can be fed to a transmitter’s analog input; a second radio or an SDR receiver can capture the signal for SSTV software to turn back into an image.
How the ESP32-CAM SSTV camera works
The build uses a classic ESP32-CAM development board to take a picture, then firmware encodes it as audio in one of two supported slow-scan television (SSTV) formats: Robot color24 or Martin M1. Rather than sending a conventional digital file, it represents the image as audio tones that a compatible receiver can decode.
- Capture: The ESP32-CAM takes a still image.
- Encode: Firmware converts the image into SSTV audio using Robot color24 or Martin M1.
- Transmit: GPIO4 produces PWM-modulated audio that can be connected approximately directly to a radio transmitter’s analog input.
- Receive and decode: A receiving radio or SDR provides the audio to SSTV receiver software, which demodulates it into an image.
The project’s hardware and signal path are described by Dzl TheEvilGenius’s project page; Hackaday’s coverage of the transceiver setup also outlines the ESP32 output and radio arrangement.
What radio can receive an SSTV picture?
A second Baofeng-style handheld transceiver can serve as a receiver, according to Hackaday, and a USB SDR dongle is another option. In either case, the received audio must reach SSTV receiver software; the radio alone does not turn the audio into a viewable picture.
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- Simplify your IoT and DIY projects with the ESP32-CAM Development Board, featuring an automatic download function and a convenient Type-C interface for seamless programming and easy connectivity
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- Handheld radio: A compatible transceiver can receive the signal and provide audio to decoding software.
- USB SDR: An SDR dongle can receive the radio signal and pass audio to software for SSTV decoding.
For a basic build, the ESP32-CAM is the camera and encoder, a suitable transmitter carries the audio, and a separate receiver plus SSTV software reconstructs the image. The project describes the PWM output as approximately direct to the transmitter’s analog input; it does not publish a detailed electrical interface specification, so verify compatibility with the particular radio before connecting hardware.
Why use SSTV instead of a custom digital link?
The project author chose SSTV because designing a custom digitally modulated radio link with forward-error correction would take more work. SSTV provides an established way to represent images as audio, keeping the camera build comparatively simple for remote, low-bandwidth use.
Rank #2
- ESP32CAM is based on ESP32 chip and OV camera module, use low-power dual-core 32-bit CPU, which can be used as an application processor.
- The main frequency is up to 240MHz, and the computing power is up to 600 DMIPS.
- Built-in 520 KB SRAM , external 8MB PSRAM ,support UART/SPI/I2C/PWM/ADC/DAC and other interfaces;Support picture wireless upload, TF card, multiple sleep modes, STA/AP/STA+AP working mode, secondary development.
- It is an ideal solution for IoT applications. The ESP-32CAM comes in a DIP package that plugs directly into the backplane for rapid production.
- ESP-32CAM can be widely used in various IoT applications. Suitable for home smart devices, industrial wireless control, wireless monitoring, QR wireless identification, wireless positioning system signals, etc.
Dzl TheEvilGenius said on September 14, 2022, that the approach “works surprisingly well and is pretty robust to noise.” That is the author’s qualitative assessment, not a controlled noise test. The project and its coverage do not report a measured range, bitrate, image-resolution benchmark, transmission-time benchmark, or quantified noise performance.
Do you need a ham radio license to transmit SSTV?
If you transmit on amateur-radio bands, licensing requirements apply. Hackaday notes that a license is required for amateur-band transmission; the specific rules depend on where you are and the frequency and service you use. Check your local regulator’s current requirements before transmitting, and use only frequencies and equipment permitted for your circumstances. Hackaday’s licensing note provides the project’s reminder, not a substitute for local regulatory guidance.
Rank #3
- ESP32-S3 camera board: Dual-core 32-bit microprocessor up to 240 MHz, 8 MB flash, 8 MB PSRAM, onboard 2.4 GHz Wi-Fi and Bluetooth 5 (LE), USB-OTG, USB code uploader, camera, memory card slot (Comes with 1GB memory card and card reader)
- Detailed tutorial: Can be downloaded (in English) or viewed online (original in English, can be translated into other languages by browsers) (The tutorial link can be found on the product box, no paper tutorial)
- Example projects: Provides step-by-step guide and several typical projects, each project has complete code and detailed explanations
- 2 sets of code: MicroPython and C. Python is one of the most popular languages, and C is one of the most classic languages
- Easy to use: Just connect the board to your computer (installed IDE and driver) with the USB cable to program it
What to expect from this project
This is a practical route to sending still images over a narrowband analog radio path when simplicity matters more than transmitting a standard image file. Its defining trade-off is that the image is conveyed as SSTV audio and requires decoding software at the receiving end. Published project information does not establish numeric performance, so range, transmission duration, image detail, and robustness in a particular setup should not be assumed from the description alone.
Quick Recap
Rank #4
- Package included:2pcs ESP32-CAM-MB Camera Module and 2pcs USB-TTL Serial Adapter Module.Compared with the old model, it does not require complex wiring and supports manual and automatic downloads
- HK-ESP32-CAM-MB adopts Micro USB interface, convenient and reliable connection method, convenient to apply to various IoT hardware terminal occasions
- HK-ESP32-CAM-MB module can work independently as the smallest system
- A new W-BT dual-mode development board based on ESP32 design, using PCB on-board antenna, with 2 high-performance 32-bit LX6CPU, using 7-level pipeline architecture, main frequency adjustment range 80MHz to 240Mhz
- Ultra-low power consumption, deep sleep current is as low as 6mA. It is an ultra-small 802.11b/g/n W+ BT/BLE SoC module -->>Our technical service team is always ready to answer your questions. please feel free to contact us--）
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