Digital signal processing:
I2S in ESP32
Anthony LE CREN, F4GOH – KF4GOH1/14
(K)F4GOH, Anthony Le Cren
• Ham since 2010,
• Conception,
• Development,
• Not really active on air.
2/14
Professor of computer science at Gabriel Touchard – Washington High
School. (Le Mans, France)
3/23
ESP32
4/14
Up to 240 Mhz
WiFi
Inside ESP32
5/14
Boards description
6/14
ESP32 Sheild (top) (below)
DRA818+OLED RC Filter+PTT
ADC DAC
Smartphone and Wifi AP
7/14
• Smartphone receive and send messages with a web browser
• No specific application in the smartphone
• ESP32 encode and decode audio signal from the DRA818
FreeRTOS
8/14
• Native for ESP32
• Handle multiple tasks in parallel
• Kind of turnstile
RTTY
9/14
RTTY decoding
• Goertzel algorithm and RTTY decoder
• Wifi Acces point
• Web server
• RTTY encoder
10/14
The WEB server manque le bt config
11/14
Field exercise
12/14
Updates
• Add numeric pass band filter on reception.
• RTTY with 1,5 bit stop
• Record RTTY configuration.
• APRS decode and encode
13/14
Contact Information
14/14
• https://hamprojects.wordpress.com/