Recently DORJI released a type of long range wireless module DRF1268DS. The module has up to 22dBm output power and 10mA receive current. It provides four power modes which make it very suitable for battery-powered applications. The line of sight distance can be 3~5km according to the testing environment.
Features:
*433MHz ISM frequency band
High sensitivity: -143dBm @ power mode 0
Max. Output power: 22dBm
RF data rate: 0.073~62.5k bps
UART data rate: 1.2~57.6k bps
Standard /star network mode
Multiple channel & air wake-up
Receive current: 10mA
Sleep current: 2uA
Working voltage: 2.8~6V
Working temperature: -40~+85℃
The module provides standard communication (transparent data transmission) and star network communication. In star network communication, the module can be worked in central mode or node mode which makes the projects for home automation much easier. It has the standard UART interface and can easily communicate with Arduino UNO or other Arduino kits. The arduino codes based on Arduino UNO is in the attachments.
If you have the interest in testing these modules and would like to share your experience of using the products with other users here, you can reply this topic and send your address (post code and telephone number are needed for the logistics company) to me by email or private message. For the first ten replies (independant users here), we will offer 1 pair of modules for each users. If you don't like 433MHz, we can offer 868Mhz or 915MHz version of DRF1262DS module instead.
I'm interested in evaluating your 868MHz modules (sx1262 ?)
(I wrote about LoRa and LoRaWan in french Arduino forum and I currently evaluate 868MHz CDEbyte E32 modules for p2p under LoRa)
I'm interested in evaluating your 868MHz modules (sx1262 ?)
(I wrote about LoRa and LoRaWan in french Arduino forum and I currently evaluate 868MHz CDEbyte E32 modules for p2p under LoRa)
Regards
Thank you for your interest. Would you be kind to send me your detailed shipment addres by private message or email?
srnet:
On the Dorji DRF1268 modules there is a pin labeled 'SW'.
The data sheet shows that this pin is connected via a 100R resistor to the VCC pin of the output RF switch.
Is the intention that this pin is normally connected direct to VCC on the module ?
Hello Stuart,
The SW pin is connected to the /CTRL(or VDD) pin of RF switch PE4259. In normal operation, it should be connected to VCC but in sleep mode, it should be connnected to GND in order to reduce the static current. Therefore you can use a I/O pin to control it.
dorji_com:
The SW pin is connected to the /CTRL(or VDD) pin of RF switch PE4259. In normal operation, it should be connected to VCC but in sleep mode, it should be connnected to GND in order to reduce the static current. Therefore you can use a I/O pin to control it.
Are you absolutly sure about that ?
The data sheet for the DRF1268F seems very clear;
DIO2 controls the /CTRL pin of RF switch PE4259.
and
The SW pin is connected to the VDD pin of RF switch PE4259.
Seems to me that you need to use both SW and DIO2 for controlling the DRF1268F, DIO2 when switching between RX and TX and SW when you want to put the device to sleep.
I am aware thet you would normally use the SetDIO2AsRfSwitchCtrl option to control DIO2 automatically.
The SW pin is connected to the VDD pin of RF switch PE4259.
Seems to me that you need to use both SW and DIO2 for controlling the DRF1268F, DIO2 when switching between RX and TX and SW when you want to put the device to sleep.
I am aware thet you would normally use the SetDIO2AsRfSwitchCtrl option to control DIO2 automatically.
Thanks for the update. The DIO2 pin is used to switch RX and TX of sx1262 when the SW is connected to VCC. If you want to minimize the sleep current (<1uA) of DRF1268T, the PE4259 should be shut up totally by setting SW and DIO2 pins to GND.
In the original post I notice that the DRF1262DS is connected directly to a Arduino UNO.
The UNO digital pins are 5v. But in the DRF1262DS data sheet it states that:
Oldtron:
In the original post I notice that the DRF1262DS is connected directly to a Arduino UNO.
The UNO digital pins are 5v. But in the DRF1262DS data sheet it states that:
Rx 3.3v
Tx 3.3v
Mo grd or 3.3v
Wonder which I should believe ?
Thanks for your update. The logic level of DRF1262DS is 3.3V so it will be better to connect it to 3.3V I/O pins. Anyway we add serial resistor on the I/O pins of the modules to restrict the current so these pins can be connected to 5V pins of UNO.