Failed to communicate with MPR121

[Robert-815]

I have ordered all the parts to make the ESP8266 touch panel, including the custom PCBs from JLCPCB. Unfortunately, I am experiencing great difficulties getting the ESP8266 to recognize the MPR121. I receive the error Communication with MPR121 failed!. I have included all relevant information below:

Logs at the bottom

Components I have used:

• The first MPR121 I tried (Amazon)
• The second MPR121 I tried (Amazon)
• The first ESP8266 I tried (Amazon)
• The second ESP8266 I tried (Amazon)

Steps I have taken to troubleshoot so far:

• Various combinations of ESPs and MPR121s
• Reserved IP address for ESP
• Soldering all connections
• Using a breadboard to test the connections
• Trying different pins on the ESP8266 to connect the SDA/SCL pins on the MPR121 (and updating the new pins in the code)

I am perplexed by this issue and hope someone can help. Thank you for your time.

Logs:

[I][app:029]: Running through setup()...
[I][i2c.arduino:161]: Performing I2C bus recovery
[C][esp8266_pwm:017]: Setting up ESP8266 PWM Output...
[C][mpr121:011]: Setting up MPR121...
[E][component:112]: Component mpr121 was marked as failed.
[C][wifi:037]: Setting up WiFi...
[D][wifi:373]: Starting scan...
[D][wifi:388]: Found networks:
[I][wifi:431]: - 'MyWifiName' [redacted]▂▄▆█
[D][wifi:433]:     Channel: 3
[D][wifi:434]:     RSSI: -57 dB
[I][wifi:431]: - 'MyWifiName' [redacted]▂▄▆█
[D][wifi:433]:     Channel: 3
[D][wifi:434]:     RSSI: -67 dB
[I][wifi:431]: - 'MyWifiName' [redacted]▂▄▆█
[D][wifi:433]:     Channel: 1
[D][wifi:434]:     RSSI: -78 dB
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[D][wifi:436]: - [redacted] [redacted]▂▄▆█
[I][wifi:248]: WiFi Connecting to 'MyWifiName'...
[I][wifi:505]: WiFi Connected!
[C][wifi:353]:   Local MAC: [redacted]
[C][wifi:354]:   SSID: [redacted]
[C][wifi:355]:   IP Address: 192.168.1.43
[C][wifi:356]:   BSSID: [redacted]
[C][wifi:358]:   Hostname: 'touchpanel3'
[C][wifi:360]:   Signal strength: -67 dB ▂▄▆█
[C][wifi:364]:   Channel: 3
[C][wifi:365]:   Subnet: 255.255.255.0
[C][wifi:366]:   Gateway: 192.168.1.1
[C][wifi:367]:   DNS1: 192.168.1.1
[C][wifi:368]:   DNS2: 0.0.0.0
[D][wifi:514]: Disabling AP...
[C][ota:085]: Over-The-Air Updates:
[C][ota:086]:   Address: touchpanel3.local:8266
[C][api:025]: Setting up Home Assistant API server...
[I][app:062]: setup() finished successfully!
[I][app:102]: ESPHome version 2022.6.2 compiled on Jul 20 2022, 16:08:51
[I][app:104]: Project jagr.touch_panel version 0.1
[C][wifi:491]: WiFi:
[C][wifi:353]:   Local MAC: [redacted]
[C][wifi:354]:   SSID: [redacted]
[C][wifi:355]:   IP Address: 192.168.1.43
[C][wifi:356]:   BSSID: [redacted]
[C][wifi:358]:   Hostname: 'touchpanel3'
[C][wifi:360]:   Signal strength: -67 dB ▂▄▆█
[C][wifi:364]:   Channel: 3
[C][wifi:365]:   Subnet: 255.255.255.0
[C][wifi:366]:   Gateway: 192.168.1.1
[C][wifi:367]:   DNS1: 192.168.1.1
[C][wifi:368]:   DNS2: 0.0.0.0
[C][logger:275]: Logger:
[C][logger:276]:   Level: DEBUG
[C][logger:277]:   Log Baud Rate: 115200
[C][logger:278]:   Hardware UART: UART0
[C][i2c.arduino:038]: I2C Bus:
[C][i2c.arduino:039]:   SDA Pin: GPIO0
[C][i2c.arduino:040]:   SCL Pin: GPIO4
[C][i2c.arduino:041]:   Frequency: 50000 Hz
[C][i2c.arduino:044]:   Recovery: bus successfully recovered
[I][i2c.arduino:054]: Results from i2c bus scan:
[I][i2c.arduino:056]: Found no i2c devices!
[C][esp8266_pwm:022]: ESP8266 PWM:
[C][esp8266_pwm:023]:   Pin: GPIO14
[C][esp8266_pwm:024]:   Frequency: 1000.0 Hz
[C][mpr121:064]: MPR121:
[C][mpr121:065]:   Address: 0x5A
[E][mpr121:068]: Communication with MPR121 failed!
[C][rtttl:018]: Rtttl
[C][captive_portal:088]: Captive Portal:
[C][mdns:084]: mDNS:
[C][mdns:085]:   Hostname: touchpanel3
[C][ota:085]: Over-The-Air Updates:
[C][ota:086]:   Address: touchpanel3.local:8266
[W][ota:094]: Last Boot was an unhandled reset, will proceed to safe mode in 7 restarts
[C][api:138]: API Server:
[C][api:139]:   Address: touchpanel3.local:6053
[C][api:143]:   Using noise encryption: NO

[Robert-815]

@j-a-g-r Any thoughts on why this might be?

[j-a-g-r]

Hi,

sorry for responding so late! I think you need to switch the wires connected to D2 and D3 so that the pin marked SDA on the MPR121 is connected to D3 and the pin marked SCL is connected to D2.

Please let me know if this solved your Problems.