SKU: 79375639565

RadioMaster ERS-BA01 Precision Barometric Altitude Sensor for ELRS System

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Description

RadioMaster ERS-BA01 Precision Barometric Altitude Sensor for ELRS SystemThe ERS BA01 Barometer Sensor provides accurate, real time altitude data for compatible ExpressLRS receivers. By capturing barometric pressure and converting it into precise relative altitude information, the ERS BA01 delivers reliable telemetry back to your EdgeTX radio. This sensor provides clear, responsive altitude monitoring. As part of the ERS sensor family, the ERS BA01 also supports pass through expansion, allowing easy daisy chaining with

The ERS-BA01 Barometer Sensor provides accurate, real-time altitude data for compatible ExpressLRS receivers. By capturing barometric pressure and converting it into precise relative altitude information, the ERS-BA01 delivers reliable telemetry back to your EdgeTX radio. This sensor provides clear, responsive altitude monitoring. 

As part of the ERS sensor family, the ERS-BA01 also supports pass-through expansion, allowing easy daisy-chaining with additional telemetry modules.

Features

  • Real-Time Altitude Telemetry: Converts barometric pressure measurements into accurate relative altitude data for instant feedback on your radio.
  • Expansion-Ready Pass-Through: Includes an in-and-out port for daisy-chaining additional ERS sensors without rewiring your setup.
  • Seamless ExpressLRS Compatibility: Integrates easily with supported ExpressLRS PWM receivers via CRSF for fast and dependable data transmission.

Specifications

  • Item: ERS-BA01 Barometer Sensor
  • Operating voltage: 5–8.4V
  • Operating current: 9mA
  • Altitude accuracy: ±0.5m
  • Temperature range: –10 ℃ to +85 ℃
  • Size: 23.5 × 13 × 7mm
  • Weight: 3.5g

Using Sensors with Non-Plug-and-Play PWM ExpressLRS Receivers

Most PWM ExpressLRS receivers are fully compatible; those without a dedicated UART port require reconfiguration to support external sensors (e.g., for telemetry). To enable this, reassign two PWM output pins as a serial UART—one for TX and one for RX—via the receiver's Web UI (accessed by putting the receiver into WiFi mode) or via the ExpressLRS LUA script. This enables sensor connectivity while preserving the remaining PWM channels for servos or ESCs.

Includes

  • 1 x ERS-BA01 Precision Barometric Altitude Sensor
  • 3 x Heat-Shrinkable Tube
  • 1 x Manual QR Code Card

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Shipping Notes
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  • Except Preorder products are shipped in 48 hours.
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 79375639565

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4.7 ★★★★★
Based on 6 reviews
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Stacy
Omaha, US
★★★★★ 5
My Dog's All-Time Favorite Toy
Color: Pink, Style: Grunt Sound
The first one of these I ever got her was at Petco on sale for $1 - best $1 ever! The reviews are right, though. The toy doesn't last forever and it's not good for aggressive chewers. In my opinion, however, that doesn't make it a bad toy. Here's why: Aggressive chewers comments: Getting my sister's French Bulldog a stuffed toy (that's shredded in 5 minutes), compared to my Pitbull who does not tear up any toys, but is a stronger chewer when it comes to bones. My pup does not tear this up at all, but my sister's dog would. My point is: Don't get your dog a soft toy if your dog ruins soft toys. Regarding the not long-lasting comments: the honking noise mechanism inside eventually pops inside the hole, rendering it honkless. Ours lasted about 6 months. It's pretty much impossible to fix unless you want to trouble yourself to fix it for 1 good honk each fix. I would, but I do also have a job to get to. My dog does still carry it around in it's noiseless state, but she doesn't play with it with the same enthusiasm. How did I resolve this? I bought her 5 😂 She's only on her second, but I decided to stock it because they were on sale for $5.10 - I don't think I will get rid of any of them. I will just let her play with them on rotation until they fall apart. Besides all that, my dog just simply loves this toy. I have never seen her so happy & playful with a toy. I can't promise this for your dog, as I can only tell you about mine. We even have a "Sheepy" song. [I have not been paid or given free Sheeps - my Sweet Pea just really loves her Sheepy]
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 26, 2024
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Verified Purchase
Whidbey Mary
Los Angeles, US
★★★★★ 5
Loud! Just Like She Likes It
Color: Hedgehog, Style: Big Squeak Hedgehog
My Great Dane loves this noisy toy. She prefers squeaky toys with loud, unusual squeakers. (I need to invest in earplugs.) She's not an agressuve chewer or rough player so this should last a long time. Like most squeaky toys she has, the squeaker wears out before the physical toy does and once the noise is gone she won't play with it any more. If others have a similar issue...check with your local animal shelter. Some (not all) will disinfect used toys for the dogs in their care.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 1, 2025
S
Verified Purchase
Sport
Lowell, US
★★★★★ 5
Good toy
Color: Gator, Style: Accordionz (Grunt Sound)
Fun toy, holding up really well.
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Reviewed in the United States on June 1, 2026
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Verified Purchase
Reviewer
West Palm Beach, US
★★★★★ 1
Fun while it lasts…
Color: Pink, Style: Grunt Sound
Fun while it lasts. Doesn’t last very long. This is our third one and last maybe a few weeks. The part that makes noise comes detached inside which causes to toy to no longer make noise, but also can be dangerous if it comes out.
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Reviewed in the United States on June 11, 2026
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Verified Purchase
Betty Jo Bradley
Dallas, US
★★★★★ 4
Great alternative to the grunting pigs!
Color: Pink, Style: Grunt Sound
We go through A LOT of dog toys at my dog based business. The grunting pigs are super cute, but they are also super fragile. It is incredibly easy to dislodge the squeaker. (Grunter?) These are certainly not robust chew toys, but the squeaker is about 30% better at staying put than that of the pigs. It's also smaller, so it's easier for the smaller dogs to play with. These are a new favorite! Update: August, 2024 I bought an orange hedgehog. Amazon won't let me review that separately so I had to add to my sheep review. The orange hedgehog is only 3 stars. It is made of a harder plastic than the bear and the sheep. It also has a standard squeaker, not the grunting of the bear and sheep. But harder plastic DOES NOT mean that it will withstand an aggressive chewer! If your dog likes to "kill the squeaker" they will be able to do so in minutes! This IS NOT a chew toy! If you are looking for a toy for an aggressive chewer, look at the Orbeez line from Outward Hound. The other thing that makes me less enthusiastic about the orange hedgehog is that the yellow paint started flaking off immediately. I will have to scrub it all off because it looks terrible! The dogs don't care, but their owners sure do! I haven't had that problem with the sheep or the bears. The orange hedgehog is almost like it's from a completely different company!
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Reviewed in the United States on February 16, 2024

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