diff --git a/copper/src/config.rs b/copper/src/config.rs
index 03620d0c5..6b091f36e 100644
--- a/copper/src/config.rs
+++ b/copper/src/config.rs
@@ -1,11 +1,14 @@
 use std::collections::HashMap;
+use std::iter::Map;
+use std::path::Iter;
 
 use petgraph::dot::Config as PetConfig;
 use petgraph::dot::Dot;
-use petgraph::stable_graph::StableDiGraph;
+use petgraph::graph::NodeIndex;
+use petgraph::stable_graph::{NodeIndices, StableDiGraph};
 use ron::extensions::Extensions;
-use ron::Options;
 use ron::value::Value as RonValue;
+use ron::Options;
 use serde::{Deserialize, Serialize};
 use uom::si::rational::Time;
 use uom::si::time::nanosecond;
@@ -98,6 +101,10 @@ impl ConfigNode {
         self
     }
 
+    pub fn get_type_name(&self) -> &str {
+        self.type_name.as_ref().unwrap()
+    }
+
     #[allow(dead_code)]
     pub fn base_period(&self) -> Option<Time> {
         self.base_period_ns
@@ -133,12 +140,15 @@ pub struct CopperConfig {
     pub graph: StableDiGraph<ConfigNode, String, ConfigNodeId>,
 }
 
-impl CopperConfig {
-    pub fn new() -> Self {
+impl Default for CopperConfig {
+    fn default() -> Self {
         CopperConfig {
             graph: StableDiGraph::new(),
         }
     }
+}
+
+impl CopperConfig {
     pub fn add_node(&mut self, node: ConfigNode) -> ConfigNodeId {
         self.graph.add_node(node).index() as ConfigNodeId
     }
@@ -147,6 +157,13 @@ impl CopperConfig {
         self.graph.node_weight(node_id.into())
     }
 
+    pub fn get_all_nodes(&self) -> Vec<&ConfigNode> {
+        self.graph
+            .node_indices()
+            .map(|node| &self.graph[node])
+            .collect()
+    }
+
     pub fn connect(&mut self, source: ConfigNodeId, target: ConfigNodeId, msg_type: &str) {
         self.graph
             .add_edge(source.into(), target.into(), msg_type.to_string());
diff --git a/copper_derive/src/lib.rs b/copper_derive/src/lib.rs
index 29d9485ba..ca43218c1 100644
--- a/copper_derive/src/lib.rs
+++ b/copper_derive/src/lib.rs
@@ -3,10 +3,15 @@ extern crate proc_macro;
 use copper::config::CopperConfig;
 use format::{highlight_rust_code, rustfmt_generated_code};
 use proc_macro::TokenStream;
+use proc_macro2::Ident;
 use quote::quote;
 use syn::meta::parser;
+use syn::punctuated::Punctuated;
 use syn::Fields::{Named, Unit, Unnamed};
-use syn::{parse_macro_input, parse_quote, Field, ItemStruct, LitStr};
+use syn::{
+    parse_macro_input, parse_quote, parse_str, Field, FieldMutability, ItemStruct, LitStr, Type,
+    TypeTuple,
+};
 
 mod format;
 mod utils;
@@ -34,15 +39,41 @@ pub fn copper_runtime(args: TokenStream, input: TokenStream) -> TokenStream {
     config_full_path.push(config_file);
     let config_content = std::fs::read_to_string(&config_full_path)
         .unwrap_or_else(|_| panic!("Failed to read configuration file: {:?}", &config_full_path));
-    println!("Config content:\n {}", config_content);
-    let deserialized = CopperConfig::deserialize(&config_content);
 
-    let name = &item_struct.ident;
+    let copper_config = CopperConfig::deserialize(&config_content);
+    let all_node_configs = copper_config.get_all_nodes();
+
+    // Collect all the type names used by our configs.
+    let all_configs_type_names = all_node_configs
+        .iter()
+        .map(|node_config| node_config.get_type_name());
 
-    let new_field: Field = parse_quote! {
-        node_instances: (u32, i32)
+    // Transform them as Rust types
+    let all_configs_types: Vec<Type> = all_configs_type_names
+        .map(|name| {
+            println!("Found type: {}", name);
+            parse_str(name).unwrap()
+        })
+        .collect();
+
+    // Build the tuple of all those types
+    let tuple_types = TypeTuple {
+        paren_token: Default::default(),
+        elems: Punctuated::from_iter(all_configs_types),
     };
 
+    // add that to a new field
+    let new_field = Field {
+        attrs: Vec::new(),
+        vis: syn::Visibility::Inherited,
+        mutability: FieldMutability::None,
+        ident: Some(Ident::new("node_instances", proc_macro2::Span::call_site())),
+        colon_token: Some(syn::Token![:](proc_macro2::Span::call_site())),
+        ty: Type::Tuple(tuple_types),
+    };
+
+    let name = &item_struct.ident;
+
     match &mut item_struct.fields {
         Named(fields_named) => {
             fields_named.named.push(new_field);
diff --git a/copper_derive_test/Cargo.toml b/copper_derive_test/Cargo.toml
index d9e9ba185..72f6768e4 100644
--- a/copper_derive_test/Cargo.toml
+++ b/copper_derive_test/Cargo.toml
@@ -5,6 +5,8 @@ edition = "2021"
 
 [dependencies]
 copper-derive = { path = "../copper_derive" }
+simplelogger = { path = "../examples/simplelogger" }
+v4lsrc = { path = "../examples/v4lsrc" }
 
 [build-dependencies]
 copper = { path = "../copper" }
diff --git a/copper_derive_test/copperconfig.ron b/copper_derive_test/copperconfig.ron
index 9bd5f0a35..a6d5123f3 100644
--- a/copper_derive_test/copperconfig.ron
+++ b/copper_derive_test/copperconfig.ron
@@ -2,29 +2,26 @@
     graph: (
         nodes: [
             (
-                instance_name: "copper-isp",
-                type_name: "isppkg::Isp",
+                instance_name: "camera",
+                type_name: "v4lsrc::Video4LinuxSource",
                 base_period_ns: 1000000000,
+                instance_config: {
+                    "device": "/dev/video0",
+                },
             ),
             (
-                instance_name: "camera",
-                type_name: "camerapkg::Camera",
+                instance_name: "logger",
+                type_name: "simplelogger::SimpleLogger",
                 base_period_ns: 60000000000,
                 instance_config: {
-                    "resolution-height": 1080,
+                    "path": "/tmp/stuff.cu",
                 },
             ),
-            (
-                instance_name: "copper-algo",
-                type_name: "algopkg::Algo",
-                base_period_ns: 5000000000,
-            ),
         ],
         node_holes: [],
         edge_property: directed,
         edges: [
-            (1, 0, "imgmsgpkg::Image"),
-            (0, 2, "imgmsgpkg::Image"),
+            (0, 1, "v4lsrc::ImageMsg"),
         ],
     ),
-)
\ No newline at end of file
+)