door intercom

[gemu2015]

this describes an audio intercom with push to talk interface.

it may be used for a door intercom, or baby phone or similar

Hardware requirements:
any ESP32 should work (except C3), no PSRAM needed.
I2S Audio DAC with amplifier https://www.ebay.de/itm/165446200440?hash=item26855cac78:g:A8EAAOSwDspiY5o4
I2S microphone https://www.ebay.de/itm/173974875385?hash=item2881b5ecf9:g:B-cAAOSwZbRdVhJf

connect Audio DAC and microphone to any suitable ESP32 pins, microphone VCC must not be higher than 3.3 V. connect L/R pin to GND, connect an (8 Ohm) speaker to the DAC
and set the appropriate I2S settings in Tasmota GPIO WebUI.
I2S_BLK,I2S_WS,I2S_DOUT,I2S_DIN

you need 2 of these ESP devices, one for the door and one in house.

these are the console cmds to setup the bridge

// set slave ip, the ip of the door device
i2sbridge 192.168.188.105
// swap microphone channels, 6 swap on, 7 = swap off
i2sbridge 6
// set master mode, 4 = master, 5 = slave
i2sbridge 4
// set push to talk pin (here pin 13)
// when set pushing sets write mode, releasing sets read mode
i2sbridge p13
; start bridge 1 = read from slave, 2 = write to slave, 3 = loopback, 0 = off
i2sbridge 1
; set micro gain factor G = 1-50
i2smgain G

slave does not need any preset, except mgain or mic swap when desired

currently settings are not persistent and have to be preset at boot time by rule or script

here is a script example to setup a master device

>D
once=0
res=0
p:micgain=0
micrec=0
bridge=0

>BS

>F
if chg[micgain]>0 {
->i2smgain %0micgain%
}

>S
if wifis>0
and once==0 {
; set slave ip
=>i2sbridge 192.168.188.105
;swap microphone source
=>i2sbridge 6
; set to master mode
=>i2sbridge 4
; set ptt pin
=>i2sbridge p13
; set mic gain
=>i2smgain %0micgain%
once=1
}

if chg[bridge]>0 {
if bridge>0 {
=>i2sbridge 1
} else {
=>i2sbridge 0
}
}

>WS
sl(1 50 micgain "1" "Micro gain : %0micgain%" "50")
bu(bridge "Stop audio bridge" "Start audio bridge")

defines for user_config_override:
#define USE_SHINE
#define USE_I2S_AUDIO
#define USE_I2S_MIC
#define I2S_BRIDGE
#define MICSRATE 16000
#define MIC_CHANNELS 2

[dcast78]

Trying to use your user_config_override

#define USE_SHINE
#define USE_I2S_AUDIO
#define USE_I2S_MIC
#define I2S_BRIDGE
#define MICSRATE 16000
#define MIC_CHANNELS 2

I have 2 problems

1. USE_I2S_MIC produce this error
   tasmota/tasmota_xdrv_driver/xdrv_42_1_i2s_mp3mic.ino:128:10: fatal error: layer3.h: No such file or directory

2. USE_I2S_AUDIO no error but command Unknown on console
   19:16:34.283 CMD: i2sbridge 6
19:16:34.289 RSL: RESULT = {"Command":"Unknown"}

Environment:

• Visual studio code with platformio.
• Fresh clone of tasmota repo.
• Correct upload and working tasmota firmware

Any idea?

Thanks

[gemu2015]

you must add in linker section lib_extra_dirs
lib/libesp32_audio

Then define the i2s pins in tasmota GUI and watch the console on reboot

[dcast78]

Ok
also added lib/libesp32

now my lib_extra_dirs is

lib_extra_dirs          = ${common.lib_extra_dirs}
                        lib/libesp32
                        lib/libesp32_audio

all commands are accepted.

I2s work correctly with i2srec and i2splay.

To add script this is needed

#ifndef USE_SCRIPT
#define USE_SCRIPT  // adds about 17k flash size, variable ram size
#endif
#ifdef USE_RULES
#undef USE_RULES
#endif 

At the moment intercom is not working, but I have made some steps forward.

A question... You have used only one I2S bus or two I2S bus, one for ti he mic and one for the speaker?

[gemu2015]

no, you must use one i2s bus for mic and speaker, either i2s bus number 1 or 2

watch the web console in master and slave, this should give hints what is going on

[blakadder]

I'm trying to use this feature but i2sbridge and also i2srec ans i2sstream is crashing Tasmota on multiple devices (M5StickC, ESP-S2 with microphone, XIAO ESPS3 Sense.
This is the error:

Guru Meditation Error: Core  1 panic'ed (IntegerDivideByZero). Exception was unhandled.

Core  1 register dump:
PC      : 0x4019a7bb  PS      : 0x00060d30  A0      : 0x8019aed4  A1      : 0x3ffd2df0  
A2      : 0x00000000  A3      : 0x00000000  A4      : 0x3ffeea3c  A5      : 0x00000000  
A6      : 0x3ffeea3c  A7      : 0x3ffc7ea8  A8      : 0x00000100  A9      : 0x00000002  
A10     : 0x00000000  A11     : 0x00000000  A12     : 0x00000000  A13     : 0xffffefff  
A14     : 0xffffffbf  A15     : 0x00000008  SAR     : 0x00000020  EXCCAUSE: 0x00000006  
EXCVADDR: 0x00000000  LBEG    : 0x4008c5ac  LEND    : 0x4008c5b7  LCOUNT  : 0xffffffff  


Backtrace: 0x4019a7b8:0x3ffd2df0 0x4019aed1:0x3ffd2e30 0x4016422f:0x3ffd2e60 0x401642a2:0x3ffd2ed0 0x40165a4f:0x3ffd2f00 0x4014b211:0x3ffd2f50 0x4010b5da:0x3ffd2f70 0x4010ca51:0x3ffd2f90 0x4010e215:0x3ffd2fc0 0x40164402:0x3ffd3030 0x4014e8c5:0x3ffd3050 0x40187756:0x3ffd3070 0x40196d81:0x3ffd3090 0x400f6d3f:0x3ffd3100

[gemu2015]

did you apply these defines ?

#define MP3_MIC_STREAM
#define USE_I2S_MIC
#define USE_SHINE
#define USE_I2S_AUDIO
#define I2S_BRIDGE

and you need PSRAM for STREAM, and REC cause MP3 Encoder needs much RAM

and you must setup in TASMOTA GUI
I2S_BLK,I2S_WS,I2S_DOUT,I2S_DIN

i did successfully test with ESP32 and ESP32-S3 not S2