# Display over air
**URL:** https://forum.sensor.community/t/display-over-air/1282
**Category:** Feature Requests
**Created:** [March 10, 2022, 11:00am UTC](https://forum.sensor.community/t/display-over-air/1282 "2022-03-10T11:00:09Z")
**Posts on this page:** 6
**Page:** 2
### Author:  [@divfili](https://forum.sensor.community/u/divfili)
#### Post date: [April 8, 2022, 8:37pm UTC](https://forum.sensor.community/t/display-over-air/1282/21 "2022-04-08T20:37:55Z")
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### Author:  [@divfili](https://forum.sensor.community/u/divfili)
#### Post date: [April 8, 2022, 8:48pm UTC](https://forum.sensor.community/t/display-over-air/1282/22 "2022-04-08T20:48:08Z")
[https://www.youtube.com/shorts/s0nD-Co4h\_I](https://www.youtube.com/shorts/s0nD-Co4h_I)
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### Author:  [@bertrik](https://forum.sensor.community/u/bertrik)
#### Post date: [April 28, 2022, 4:29pm UTC](https://forum.sensor.community/t/display-over-air/1282/23 "2022-04-28T16:29:06Z")
I have been playing with the idea of using ESP-now as an interface to broadcast measurement values, without needing to set up any connection (and having to configure WiFi credentials etc).
So you have a standard sensor.community node with an ESP8266 as the sender, and a display node with another ESP8266 + OLED or RGB-LED as the receiver. You would just put the display node within WiFi range, without any configuration and it would automatically pick up the ESP-now wifi broadcast measurement values from the PM-sensor, and be able to display them numerically or perhaps as a coloured light.
ESP-now is basically a low-bitrate (1 mbps) connection-less wifi protocol, so no association is needed. You can transfer a small frame (250 bytes) enough for a simple JSON message for example. The protocol lets the sender know through an acknowledgement that the frame arrived (not for broadcast though).
I made a prototype, using a wemos d1 mini (ESP8266) as the sender and another wemos d1 mini with RGB shield as the receiver, see: [GitHub - bertrik/pmlamp-espnow-proto: Arduino project to show particulate matter concentration as a LED colour, communicated over ESP-now](https://github.com/bertrik/pmlamp-espnow-proto)
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### Author:  [@Troubadix](https://forum.sensor.community/u/Troubadix)
#### Post date: [December 23, 2022, 4:03pm UTC](https://forum.sensor.community/t/display-over-air/1282/25 "2022-12-23T16:03:43Z")
Hi,
are you still working on this?
Iām looking for an indoor display for airrohr measured values too.
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### Author:  [@air-ais](https://forum.sensor.community/u/air-ais)
#### Post date: [December 23, 2022, 10:06pm UTC](https://forum.sensor.community/t/display-over-air/1282/26 "2022-12-23T22:06:35Z")
If you are looking for a ready-made solution, this does not look bad, although perhaps a little expensive.
> **[Merlot is an open-source hardware tricolor wireless E-paper display - CNX...](https://www.cnx-software.com/2022/12/23/merlot-is-an-open-source-hardware-tri-color-wireless-e-paper-display/)**
>
> paperd.ink Merlot is a tricolor E-paper display with an open-source hardware control board based on ESP32 wireless SoC that is programmable with Arduino,
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### Author:  [@metron6](https://forum.sensor.community/u/metron6)
#### Post date: [February 5, 2025, 4:10pm UTC](https://forum.sensor.community/t/display-over-air/1282/27 "2025-02-05T16:10:10Z")
just bought the parts and wait the train from China š
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