Help with IoT water flow monitoring schematic

Projects General Guidance
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if you can find a module with Microcontroller + LoRa that meets your requirements it saves interconnecting modules reducing the possibility of poor connections and intermittent problems
for example, currently looking at using a Heltec wifi-lora-32-v3 module (as a daughter board on a custom PCB) plus solar panel on a water monitoring project

found this program which uses a Pro Mini 3.3V + RFM95W to transmits text using arduino-LoRa library

// Pro Mini RFM95 sender

// NOTE: RFM95 requires external 3.3V supply
// Pro Mini 3.3V output insufficent for transmitter OK for receiver

// Tools>Board select Pro Mini 5V or 3.3V 

// Pro_Mini connections
// Pro_Mini SCK pin GPIO13  to RFM95_pin SCK
// Pro_Mini MISO pin GPIO12  to RFM95_pin MISO
// Pro_Mini MOSI pin GPIO11  to RFM95_pin MOSI (alternate connection)
// Pro_Mini SS pin GPIO 10   to RFM95 SS
// Pro_Mini pin GPIO4   to RFM95 Reset
// Pro_Mini pin GPIO2   to RFM95 DIO0
// Pro_Mini pin GPIO6  to RFM95 DIO1  (required for LoRaWAN)

#include <SPI.h>
#include <LoRa.h>

int counter = 0;

void setup() {
  Serial.begin(57600);
  while (!Serial);
  Serial.println("\n\nPro Mini RFM95 LoRa Sender");
    //void setPins(int ss = LORA_DEFAULT_SS_PIN, int reset = LORA_DEFAULT_RESET_PIN, int dio0 = LORA_DEFAULT_DIO0_PIN);
  //LoRa.setPins(8,4,7);   // for Lora 32u4
  //LoRa.setPins(10,9,2);   // for UNO LoRa shield
  LoRa.setPins(10,4,2);   // for Pro Mini 
  if (!LoRa.begin(866E6)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }
}

void loop() {
  Serial.print("Sending packet: ");
  Serial.println(counter);

  // send packet
  LoRa.beginPacket();
  LoRa.print("hello ");
  LoRa.print(counter);
  LoRa.endPacket();
  counter++;
  delay(5000);
}

serial monitor output

Pro Mini RFM95 LoRa Sender
Sending packet: 0
Sending packet: 1
Sending packet: 2
Sending packet: 3
Sending packet: 4
Sending packet: 5

serial output of a Feather 32u4 LoRa receiver

LoRa Receiver
Received packet 'hello 0' with RSSI -50
Received packet 'hello 1' with RSSI -50
Received packet 'hello 2' with RSSI -53
Received packet 'hello 3' with RSSI -53
Received packet 'hello 4' with RSSI -53
Received packet 'hello 5' with RSSI -53
Received packet 'hello 6' with RSSI -53
Received packet 'hello 7' with RSSI -53
Received packet 'hello 8' with RSSI -50
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