diff --git a/fpga/Makefile b/fpga/Makefile
index 3614648..bb32954 100644
--- a/fpga/Makefile
+++ b/fpga/Makefile
@@ -170,7 +170,7 @@ build/%.o: %.vhd
 	ghdl -a --mb-comments --workdir="$(shell dirname "$@")" "$<"
 
 build/%_tb: build/%_tb.o $(addprefix build/,$(subst .vhd,.o,$(VHDSOURCE)))
-	ghdl -e --workdir="$(shell dirname "$@")" -o "$@" "$(basename $(notdir $<))"
+	ghdl -e --workdir="$(shell dirname "$@")" -o "$(shell echo "$@" | tr A-Z a-z)" "$(basename $(notdir $<))"
 
 build/%_tb.vcd: build/%_tb
 	(cd "$(shell dirname "$<")"; ghdl -r "$(basename $(notdir $<))" --vcd="../$@" )
diff --git a/fpga/sevenseg.vhd b/fpga/sevenseg.vhd
index c10b2d9..a133db6 100644
--- a/fpga/sevenseg.vhd
+++ b/fpga/sevenseg.vhd
@@ -14,8 +14,8 @@ end sevenseg;
 architecture structural of sevenseg is
 
     signal digit: std_logic_vector(3 downto 0);
-    signal selector: integer range 0 to 3 := 0;
-    signal counter : integer range 0 to 199999 := 0;
+    signal selector: integer := 0;
+    signal counter : integer := 0;
 
 begin
     with selector select
@@ -56,10 +56,14 @@ begin
     alternateur : process(clock)
     begin
         if clock'event and clock = '1' then
-            if counter = 0 then
-                selector <= selector + 1;
-            end if;
             counter <= counter + 1;
+            if counter >= 199999 then
+                selector <= selector + 1;
+                if selector >= 3 then
+                    selector <= 0;
+                end if;
+                counter <= 0;
+            end if;
         end if;
     end process;
 
diff --git a/fpga/sevenseg_tb.gtkw b/fpga/sevenseg_tb.gtkw
new file mode 100644
index 0000000..7211c6a
--- /dev/null
+++ b/fpga/sevenseg_tb.gtkw
@@ -0,0 +1,38 @@
+[*]
+[*] GTKWave Analyzer v3.3.86 (w)1999-2017 BSI
+[*] Sun Feb 25 12:47:52 2018
+[*]
+[dumpfile] "/home/geoffrey/Documents/Polytech/Robotech/2017-2018/CdF/cdf2018-principal/fpga/build/sevenseg_tb.vcd"
+[dumpfile_mtime] "Sun Feb 25 12:44:56 2018"
+[dumpfile_size] 111992791
+[savefile] "/home/geoffrey/Documents/Polytech/Robotech/2017-2018/CdF/cdf2018-principal/fpga/sevenseg_tb.gtkw"
+[timestart] 0
+[size] 1680 1012
+[pos] -1 -1
+*-42.000000 2550000000000 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
+[sst_width] 213
+[signals_width] 126
+[sst_expanded] 1
+[sst_vpaned_height] 296
+@23
+dut.data[15:0]
+@28
+dut.clock
+@8420
+[color] 2
+dut.counter
+@420
+[color] 2
+dut.selector
+@22
+[color] 2
+dut.digit[3:0]
+[color] 1
+dut.anode[3:0]
+@28
+[color] 1
+dut.segment[6:0]
+[color] 1
+dut.dot
+[pattern_trace] 1
+[pattern_trace] 0
diff --git a/fpga/sevenseg_tb.vhd b/fpga/sevenseg_tb.vhd
new file mode 100644
index 0000000..110794d
--- /dev/null
+++ b/fpga/sevenseg_tb.vhd
@@ -0,0 +1,59 @@
+-- Testbench automatically generated online
+-- at http://vhdl.lapinoo.net
+-- Generation date : 25.2.2018 12:42:48 GMT
+
+library ieee;
+use ieee.std_logic_1164.all;
+
+entity sevenseg_tb is
+end sevenseg_tb;
+
+architecture tb of sevenseg_tb is
+
+    component sevenseg
+        port (data    : in std_logic_vector (15 downto 0);
+              clock   : in std_logic;
+              anode   : out std_logic_vector (3 downto 0);
+              segment : out std_logic_vector (6 downto 0);
+              dot     : out std_logic);
+    end component;
+
+    signal data    : std_logic_vector (15 downto 0);
+    signal clock   : std_logic;
+    signal anode   : std_logic_vector (3 downto 0);
+    signal segment : std_logic_vector (6 downto 0);
+    signal dot     : std_logic;
+
+    constant TbPeriod : time := 20 ns;
+    signal TbClock : std_logic := '0';
+    signal TbSimEnded : std_logic := '0';
+
+    constant SegPeriod : time := 4 ms;
+    constant FourSegPeriod : time := 4 * SegPeriod;
+
+begin
+
+    dut : sevenseg
+    port map (data    => data,
+              clock   => clock,
+              anode   => anode,
+              segment => segment,
+              dot     => dot);
+
+    -- Clock generation
+    TbClock <= not TbClock after TbPeriod/2 when TbSimEnded /= '1' else '0';
+
+    clock <= TbClock;
+
+    stimuli : process
+    begin
+        data <= x"0123";
+
+        wait for 2 * FourSegPeriod;
+
+        -- Stop the clock and hence terminate the simulation
+        TbSimEnded <= '1';
+        wait;
+    end process;
+
+end tb;