diff --git a/src/modem.rs b/src/modem.rs
index b09b0e7..788bf39 100644
--- a/src/modem.rs
+++ b/src/modem.rs
@@ -499,15 +499,23 @@ impl<UART: serial::Uart> std::io::Read for Modem<UART> {
     }
 }
 
-pub fn main<T: Sync + Send>(
-    rx: esp_idf_hal::gpio::Gpio26<T>,
-    tx: esp_idf_hal::gpio::Gpio27<T>,
+pub fn main<PRx,PTx, DPK, DR, DP>
+(
+    rx: PRx,
+    tx: PTx,
     uart: serial::UART1,
-    pwrkey: esp_idf_hal::gpio::Gpio4<esp_idf_hal::gpio::Output>,
-    rst: esp_idf_hal::gpio::Gpio5<esp_idf_hal::gpio::Output>,
-    power: esp_idf_hal::gpio::Gpio23<esp_idf_hal::gpio::Output>,
+    pwrkey: DPK,
+    rst: DR,
+    power: DP,
     receiver: Receiver<Msg>,
-) -> std::result::Result<(), anyhow::Error> {
+) -> std::result::Result<(), anyhow::Error>
+where
+    PRx: esp_idf_hal::gpio::Pin + esp_idf_hal::gpio::InputPin + esp_idf_hal::gpio::OutputPin,
+    PTx: esp_idf_hal::gpio::Pin + esp_idf_hal::gpio::InputPin + esp_idf_hal::gpio::OutputPin,
+    DPK: embedded_hal::digital::v2::OutputPin,
+    DR: embedded_hal::digital::v2::OutputPin,
+    DP: embedded_hal::digital::v2::OutputPin,
+{
     let serial_pins = serial::Pins {
         tx,
         rx,