HM-11 Range

Peter Huijssen · Joined: 09 Apr 2004 Posts: 46

Hello,

I'm doing some testing with HM-11 (BlueTooth Low Energy) modules.

They are advertised of having a range of 100 meter line of sight with an Iphone.
I have tested this and only reach 8 meter.
This is also true when I connect two HM-11 with each other.

I'm beginning to suspect that I have counterfeit devices although the module seem to react like a real one.
Counterfeit devices are widely available on the market.

When I use AT+HELP I get 'www.jnhuamao.cn´ which is the designer of the HM-11.
Firmware version is HMSoft V540

Is there anyone who has any experience with this modules and did get the 100m distance between modules or module and IPhone?
Is there a way of knowing if I have the 'real' HM-11?

The HM-11 is a downsized version of the HM-10 which is the same when it comes to firmware.

Thanks in advance !

Peter

Paulvk · Joined: 28 Jul 2006 Posts: 1257 Location: SYDNEY

Hello Peter
Blue tooth uses a shared frequency segment so there are hundreds of devices making a lot of noise.
If your in the middle of some remote place you might get more than 100meters.
The modules that use lower frequencies in the VHF segment will have greater range
Regards Paul

Peter Huijssen · Joined: 09 Apr 2004 Posts: 46

Hello Paul,

Thanks for your answer. I've tested the modules in a 'low/no RF' enviroment (I live in rural area) but the range is still the same.
I have contacted the supllier and he will get back to me.

Peter

jure_m · Joined: 14 Jan 2005 Posts: 68 Location: Ljubljana

Hi Peter,

my question is a bit off-topic... how much current does HM-11 actually use? I see at ebay data: Working current: 90ua
Suspen mode: 14 uA, but is that really that small consumption? Can you confirm that?

Thanks & best regards
Jure

Peter Huijssen · Joined: 09 Apr 2004 Posts: 46

Hello Jure,

That seems a bit low to me. Click the link below and scroll to 'Electrical Characteristics'

http://wiki.seeedstudio.com/Bluetooth_V4.0_HM_11_BLE_Module/

I haven't measured it myself.

Peter