nrf uart data transmition /receving gps/gsm data

RE: nrf uart data transmition /receving gps/gsm data

jd3841 — Fri, 04 May 2018 09:39:59 GMT

thank you martinBL

RE: nrf uart data transmition /receving gps/gsm data

MartinBL — Wed, 25 Apr 2018 07:25:52 GMT

Yes, you should use a level shifter.

RE: nrf uart data transmition /receving gps/gsm data

jd3841 — Tue, 24 Apr 2018 05:21:55 GMT

I HAVE FOUND THIS FROM MY DATA SHEET SO SHOULD I USE A LEVEL SHIFTER OR NOT

RE: nrf uart data transmition /receving gps/gsm data

MartinBL — Mon, 23 Apr 2018 14:25:37 GMT

Hi,

As mtsunstrum said, you cannot connect 4 or 5 V signals directly to the nRF51.

You might be able to connect the nRF51's UART TX pin directly to your GSMs RX pin, but it is not certain that it will work. You cannot however, connect the nRF51's RX pin to the the GSM's TX pin. Then you risk burning up your nRF51. So yes, you will most likely need some sort of voltage level shifter. You can read more about it here.

RE: nrf uart data transmition /receving gps/gsm data

jd3841 — Mon, 23 Apr 2018 06:48:48 GMT

thanks but will u please explain me in more details by taking any example

as on before of now i am trying to make a connection from ardino uno board with gsm+gps module in which it work but with nrf51 i did't try

ardino uno reading is 5.0 V, 70 milliampere

while nrf reading is 2.83 , 0.0238 milli ampere

gsm uart reading is 4.02 V 15 milli ampere

SO SHOULD I MAKE DIRECT INTERFACE OR NEED TO USE LEVEL SHIFTER IC

RE: nrf uart data transmition /receving gps/gsm data

mtsunstrum — Mon, 23 Apr 2018 06:40:47 GMT

But be careful in the other direction ... from nRF51 to GSM UART ... the resistor method cannot work in that direction. Most likely solution is a voltage level-shifter IC.

RE: nrf uart data transmition /receving gps/gsm data

mtsunstrum — Mon, 23 Apr 2018 06:39:53 GMT

You can add a level-shifter IC ... or a cost-effective way is to install a series resistor between the UART signals (e.g. 20K)

The value of the resistor may need to change depending on the UART baud rate you are trying to achieve.

RE: nrf uart data transmition /receving gps/gsm data

jd3841 — Mon, 23 Apr 2018 04:23:12 GMT

so how will i connect with each other to make communication for data transmition

RE: nrf uart data transmition /receving gps/gsm data

Daniel Wang — Sat, 21 Apr 2018 13:07:27 GMT

Yes, you cannot do that. 4V is too much. Absolute max is VDD + 0.3 V

If you have VDD= 2.83 , max is 3.13 V