I am new to Stackoverflow. I have searched for answer, but didn't find anything.
I have two Raspberry Pi 2B+, each with nRF24l01 connected. I found few libraries to make this connect, only one give any results, but not connections. This one: Github BLavery
I write script to send and to recv:
send.py:
import RPi.GPIO as GPIO
from lib_nrf24 import NRF24
import time
import spidev
GPIO.setmode(GPIO.BCM)
pipes = [[0xe7, 0xe7, 0xe7, 0xe7, 0xe7], [0xc2, 0xc2, 0xc2, 0xc2, 0xc2]]
radio = NRF24(GPIO, spidev.SpiDev())
radio.begin(0, 17)
radio.setPayloadSize(32)
radio.setChannel(0x60)
radio.setDataRate(NRF24.BR_2MBPS)
radio.setPALevel(NRF24.PA_MIN)
radio.setAutoAck(True)
radio.enableDynamicPayloads()
radio.enableAckPayload()
radio.openWritingPipe(pipes[1])
radio.printDetails()
while True:
message = list("Hello World")
radio.write(message)
print("We sent the message of {}".format(message))
# Check if it returned a ackPL
if radio.isAckPayloadAvailable():
returnedPL = []
radio.read(returnedPL, radio.getDynamicPayloadSize())
print("Our returned payload was {}".format(returnedPL))
else:
print("No payload received")
time.sleep(1)
recv.py:
import RPi.GPIO as GPIO
from lib_nrf24 import NRF24
import time
import spidev
GPIO.setmode(GPIO.BCM)
pipes = [[0xe7, 0xe7, 0xe7, 0xe7, 0xe7], [0xc2, 0xc2, 0xc2, 0xc2, 0xc2]]
radio = NRF24(GPIO, spidev.SpiDev())
radio.begin(0, 17)
radio.setPayloadSize(32)
radio.setChannel(0x60)
radio.setDataRate(NRF24.BR_2MBPS)
radio.setPAlevel(NRF24.PA_MIN)
radio.setAutoAck(True)
radio.enableDynamicPayloads()
radio.enableAckPayload()
radio.openReadingPipe(1, pipes[1])
radio.printDetails()
radio.startListening()
while True:
ackPL = [1]
while not radio.available (0):
time.sleep(1/100)
receivedMessage = []
radio.read(receivedMessage, radio.getDynamicPayloadSize())
print("Received: {}".format(receivedMessage))
print("Translating the receivedMessage into unicode characters...")
string = ""
for n in receivedMessage:
# Decode into standard i=unicode set
if (n >=32 and n <= 126):
string += chr(n)
print(string)
radio.writeAckPayload(1, ackPL, len(ackPL))
print("Loaded payload reply of {}".format(ackPL))
Everything seems to be alright, below are code returned by both scripts:
send:
STATUS = 0x03 RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=1 TX_FULL=1
RX_ADDR_P0-1 =
0xf8f8f8f8f8 0xf8f8f8f8f8
RX_ADDR_P2-5 =
0xf8
0xf9
0xf9
0xf9
TX_ADDR =
0xf8f8f8f8f8
RX_PW_P0-6 =
0x0c
0x00
0x00
0x00
0x00
0x00
EN_AA =
0x0f
EN_RXADDR =
0x00
RF_CH =
0x1c
RF_SETUP =
0x00
CONFIG =
0x03
DYNPD/FEATURE =
0x03
0x01
Data Rate = 1MBPS
Model = nRF24L01
CRC Length = Disabled
PA Power = PA_MIN
We sent the message of ['H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd']
No payload received
recv.py:
STATUS = 0x03 RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=1 TX_FULL=1
RX_ADDR_P0-1 =
0xf8f8f8f8f8 0xf8f8f8f8f8
RX_ADDR_P2-5 =
0xf8
0xf9
0xf9
0xf9
TX_ADDR =
0xf8f8f8f8f8
RX_PW_P0-6 =
0x0c
0x0c
0x00
0x00
0x00
0x00
EN_AA =
0x0f
EN_RXADDR =
0x00
RF_CH =
0x1c
RF_SETUP =
0x00
CONFIG =
0x03
DYNPD/FEATURE =
0x03
0x01
Data Rate = 1MBPS
Model = nRF24L01
CRC Length = Disabled
PA Power = PA_MIN
Received: []
Translating the receivedMessage into unicode characters...
Loaded payload reply of [1]
I don't really understand why it won't connect one to other, Both have the same wiring:
nRF24L01-Raspberry Pi (Pin#)
- GND - GND (6)
- VCC - 3,3V (1)
- CE - GPIO17 (11)
- CSN - GPIO08(24)
- SCK - GPIO11 (23)
- MOSI - GPIO10 (19)
- MISO - GPIO25 (22)
- IRQ - unconnected
I need to send information from one RPi to second to control engine via PWM.
Can i ask for help