The first thing to do is to ensure the module is set to factory defaults, using the AT+ORGL command. Passkey: 1234 Device name: H-C- (or some variant depending on what is programmed in the firmware).
#ARDUINO COOLTERM BLUETOOTH#
Slave Mode Connection mode: Connect to the Bluetooth device specified Transmission rate: 38,400 bps Stop bit: 1 bit Parity bit: None. Is the HC LED slowly pulsing or fast? If it is fast, you aren't in command mode - go back over the steps above. If not, check your settings and electrical connections.
#ARDUINO COOLTERM SERIAL#
Recycle the Arduino and the HC05 should initialise and slowly flash its LED this indicates it is in Command Mode.īring up the Arduino IDE serial monitor and set to 9600+CR+LFĮnter AT and you should get OK back. Of course, some of the US manufacturers make some great boards with superior features and wonderful quality control, but that comes at a price - personally I like paying $4 for a bluetooth module, rather than $25-30.Ĭonnect/power on the Arduino, load the Arduino IDE and load the sketch above. I prefer the CZ over the JY for a few reasons it is really small, it is really well made, it has the KEY (P34, state pin) already broken out and it does level shifting of all the pins back to the 3.3V required by the HC module, unlike some of the other breakouts. You can also use a BLE (Bluetooth Low Energy) or BT4.0 device like the HC-10, but you will need a comms device that talks BLE/BT4.0 and not many computers do (a recent-model Apple Macbook Pro/Air will be able to, my recent-model HP doesn't), so by sticking to the HC-05 you can be sure of being compatible with the majority of devices.
If every JY-MCU being sold on Aliexpress was actually made by Linvor, they would be an extremely profitable company.įor an SPP module, I recommend the HC-05 Bluetooth 2.1 EDR (Enhanced Data Rate) module on a breakout board (like the JY-MCU or my personal favourite, the CZ-HC-05) If you are buying from one of the well-known Chinese market sites, check the reviews of of that product in the shop you are buying from. The ubiquitous JY-MCU breakout board has been copied and made by a vast number of Chinese board manufacturers and not all of them are good - some add level shifting for all pins from 5-7V to the 3.3V needed by the HC module, some only level shift the power pins - you get what you pay for. Be careful what you buy - not all HC modules are created equal, just as not all JY-MCU breakout boards with HC-05 modules are the same.
#ARDUINO COOLTERM SERIES#
The most popular of these SPP modules are the 'HC' series of modules.
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