# RadioMaster Zorro ELRS + RP1: specs

> Hand-held 2.4 GHz radio transmitter running EdgeTX with an internal ExpressLRS 2.4 GHz module, sold with an RP1 receiver.

[HTML version](https://soldr.ai/docs/components/radiomaster-zorro-elrs)

[Docs](https://soldr.ai/docs) / [Components](https://soldr.ai/docs/components)

Hand-held 2.4 GHz radio transmitter running EdgeTX with an internal ExpressLRS 2.4 GHz module, sold with an RP1 receiver.

Every value cites its sourcePinout not published

[Buy on Compoden](https://compoden.com/products/radiomaster-zorro-elrs-radio-transmitter-with-rp1-expresslrs-2-4ghz-nano-receiver)

## Specs

| Spec | Value | Source |
|---|---|---|
| Operating frequency | 2.400 GHz to 2.480 GHz | source Specifications (p.4) |
| Internal RF options | CC2500 multi-protocol / 4-in-1 multi-protocol / ELRS 2.4GHz (this page: ELRS version) | source Specifications (p.4) |
| ELRS RF output | 10 mW to 250 mW; 100 mW at 500 Hz update rate recommended | source Model selection and protocol selection (ELRS version) (p.3) |
| Operational current | 400 mA for ELRS at 250 mW (160 mA for the CC2500 and 4-in-1 versions) | source Specifications (p.4) |
| Operational voltage | 6.6-8.4 V DC | source Specifications (p.4) |
| Battery | 2 x 18350 (not included); built-in USB-C charging for 2x 3.7 V Lithium-Ion only, 4.2 V maximum per cell | source Specifications (p.4); Power Requirements (p.2) |
| Control channels | Maximum 16, receiver dependent | source Specifications (p.4) |
| Operating system | EdgeTX; update by USB or SD card | source Specifications (p.4) |
| Module bay | Nano size (compatible with Nano Crossfire, Nano Tracer and RadioMaster nano-size modules) | source Specifications (p.4) |
| Size and weight | 170 x 159 x 108 mm; 350 g | source Specifications (p.4) |
| Included receiver (RP1) | 5V input, CRSF protocol, 2400 MHz to 2483 MHz | source Specifications (p.1) |

## Power

| | Value | Source |
|---|---|---|
| Supply | 6.6-8.4 V DC from 2 x 18350 Lithium-Ion cells | source Specifications (p.4) |
| Current | 400 mA for ELRS at 250 mW | source Specifications (p.4) |

## Pinout
We don't publish a pin table for this part: no official source we could verify gives one. Check the labels printed on your module, and see the notes below.

## Build with it
Project ideas for the RadioMaster Zorro ELRS + RP1. Each link opens Soldr with the prompt filled in; Soldr assigns the pins, checks power and shows how to wire every part.

- [Channel viewer](https://app.soldr.ai/?prompt=I%20want%20to%20build%20a%20channel%20viewer%20that%20shows%20ExpressLRS%20stick%20values%20on%20an%20OLED%20with%20an%20ESP32): The transmitter's ELRS module and the RP1 receiver both use ExpressLRS 2.4 GHz. Power the receiver from 5 V; the manual gives no serial signal voltage, so measure the TX pad before joining it to a 3.3 V ESP32 pin. Bench only, no motors or propellers connected. Learning project.
- [Stick input recorder](https://app.soldr.ai/?prompt=I%20want%20to%20build%20a%20stick%20input%20recorder%20on%20a%20Raspberry%20Pi%205%20that%20reads%20the%20receiver%27s%20serial%20output%20while%20I%20move%20the%20sticks): The Pi header supplies the receiver's 5 V. Measure the receiver TX pad voltage before connecting it to the Pi's 3.3 V RX pin. Bench only, no motors or propellers connected. Learning project.
- [USB serial monitor](https://app.soldr.ai/?prompt=I%20want%20to%20build%20a%20receiver%20serial%20monitor%20on%20an%20ESP32-S3%20SuperMini%20that%20prints%20channel%20data%20from%20a%20transmitter%20to%20a%20computer): Powered over USB, which gives the receiver its 5 V. Check the TX pad voltage before connecting it to a 3.3 V pin. Bench only, no motors or propellers connected. Learning project.

## Common mistakes

- Charging the wrong cells. The built-in charger is for 2x 3.7 V Lithium-Ion cells only; never charge 3.6 V LiFe or 3.6 V 18350 packs with it (source: [link](https://cdn.shopify.com/s/files/1/0609/8324/7079/files/ZORRO_User_Manual.pdf), Power Requirements p.2).
- Running at full ELRS output all the time. The maker recommends 100 mW at a 500 Hz update rate, since higher output and rates may cut battery life and add heat (source: [link](https://cdn.shopify.com/s/files/1/0609/8324/7079/files/ZORRO_User_Manual.pdf), ELRS version section p.3).
- Working on a model with the propellers fitted. The maker says to disconnect power to the model and remove propellers during assembly or maintenance (source: [link](https://cdn.shopify.com/s/files/1/0609/8324/7079/files/ZORRO_User_Manual.pdf), Safety Information p.1).

## Not covered by the official source

- The sheet is a quick start guide; it gives no transmit current figure for the ELRS module other than the 400 mA operational figure.
- The guide refers to 'Boxer ELRS units' in the ELRS section, apparently copied from the Boxer guide; the 10 mW to 250 mW and 100 mW figures are used as written for the ELRS version.

## Sources

- [link](https://cdn.shopify.com/s/files/1/0609/8324/7079/files/ZORRO_User_Manual.pdf) (ZORRO Quick start guide, maker's own file)
- [link](https://cdn.shopify.com/s/files/1/0609/8324/7079/files/RP1_User_Manual.pdf) (RP1 Receiver User Manual, maker's own file)