Hello,
I ‘am planning for my new house several measurement points.
A: 1-wire bus in every room with multiple sensors (temperature/humidity/VoC)
B: multiple ESP’s in every room for different purposes
→ Every Measurement point with 24V Vcc with DC/DC for 5V/3V3 supply
I like the simplicity of the esphome project, but I do not like/trust WIFI.
Is it possible to develop a communication via single pair Ethernet or is this already done? Normal Ethernet is occupying two more wires of my smart home cable. These additional wires are a little bit overdone to me, for sending just some sensor data every xx seconds.
I also would like to use CAN-Bus Bridge communication between all ESP32 & Home-Assistant instead Wifi.
That’s a shame because wifi is well suited to tasks like this. May I ask, do you distrust wifi for concerns of reliability, concerns of security, or is this some form of irrational radiophobia? I can’t help with the latter (speak to a psychologist about that) but the first two are tractable concerns.
Reliability: It sounds like you’re being thorough in deployment of wired networking. This means your wifi network isn’t going to be under any strain. When building out, make sure you include cable drops for an appropriate number of POE-powered APs. With multiple well placed APs you can get excellent coverage so you can lower the transmit power down.
Security: This is a valid concern. You’re already well ahead by preferencing open source software like esphome over dodgy commercial solutions. Nonetheless I personally keep all of my NOT (network of things) devices on their own SSID on their own VLAN. My router is configured to only allow specific traffic to flow in and out of NOT. They can’t access my LAN or my WAN—all they can see is HA and Esphome on my docker server and an Avahi mDNS reflector on my router (for mDNS discovery). And they can accept inbound connections as long as they are sent from my desktop.
in my area 2.4GHz is so crowded that WiFi is completely unreliable. I see nearly 100 networks and sometimes get 10kbit/s. 5G works fine but so far there is no support of ESPHome HW.
single pair Ethernet could be solution. There are several PHY chips that talk over RMII and should work with ESP32. There is also Onsemi MAC+PHY chip supporting ~ 30 devices in single segment.
Here is more discussion on 10Base-t1S version