Bluetooth Smart Vs ANT+ Devices
As one who tests a lot of products, I thought it would be a great time to discuss Bluetooth Smart Vs ANT+ and why you might want to choose one method of communication over the other.
I never really ran into many problems until the end of 2017 when I had multiple devices all connecting to each other.
On typical bike setup might look like the following
- Cadence sensor: measures cadence
- Power meter: measures power output typically shown in watts
- Cyclometer: measures speed, distance, altitude… and connects to the other devices.
- Heart rate monitor: measures heart rate
Usually when cycling people will either have their phones or a cycling computer monitor their activity. Many cyclists will also want to monitor other aspects that require additional devices including power meters, cadence sensors and heart rate monitors.
These other devices will communicate using one or two different protocols including either Bluetooth Smart or ANT+ or both.
ANT+, which stands for interoperability, uses a 2.4 GHz ultra-low power wireless network to broadcast information. The purpose of ANT+ is to communicate wirelessly from one device to another device. The beauty of ANT+ is once a connection is made from one ANT+ broadcasting device to another ANT+ receiving device, other ANT+ devices aren’t blocked from receiving the same broadcast.
So for example if you have a coach who wants to monitor an athlete’s heart rate (using a Wahoo ANT+ heart rate monitor) while they are on an indoor trainer , both the athlete (using an ANT+ Wahoo Bolt) and coach (using an iPad with an ANT+ dongle) could receive the same heart rate data on different ANT+ devices.
Bluetooth Smart Communication
Bluetooth Smart communication has quite a few names including Bluetooth Low Energy (BLE) and Bluetooth 4.0. Most people are probably familiar with bluetooth and their bluetooth devices such as smart phones, iPads and computers. Because of Bluetooths communication protocol it can transmit data faster than ANT+, roughly 64x per second, 16x faster than ANT+.
When using Bluetooth, once a connection between two devices has been made, no other bluetooth accessories can connect to the same device.
So for example if you have a coach who wants to monitor an athlete’s heart rate (using a Polar Bluetooth Smart heart rate monitor) while they are on an indoor trainer , either the athlete (using an Polar Cycling Computer) or the coach (using an iPad) could monitor the heart rate data coming from the polar heart rate strap, but not both.
Once a connection has been established, access to the broadcast is no longer available.
Bluetooth Smart Vs ANT+ Advantages / Disadvantages
Which communication platform is better. From my experience ANT+ tends to be more reliable when connecting to multiple devices. Some manufactures, like Polar only broadcast information using one communication method (Bluetooth), so you’re stuck using that communication protocol. Other manufactures like Wahoo broadcast in both ANT+ and Bluetooth, so it gives you an option.
I ran into a problem with a Tacx NEO firmware update that caused errors when using Bluetooth on a Mac. Because the Tacx NEO broadcasts in both Bluetooth Smart and ANT+, I was able to alternatively use the ANT+ protocol without issue. Actually I did run into one issue. Since I switch to using ANT+, my Polar Heart Rate monitor wasn’t recognized since it broadcast in Bluetooth Smart. Getting a Wahoo HR monitor resolved the issue (Uses both ANT+ and Bluetooth).
Receiving ANT+ signals on a phone, iPad or computer often requires a ANT+ dongle.
So why use Bluetooth if ANT+ is better? In some cases because Bluetooth locks a connection between 2 bluetooth devices, it prevents others from viewing the data.